To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) A REXX clause can be coded in uppercase, lowercase, or mixed case. - This option is correct. In REXX, you can write code in uppercase, lowercase, or mixed case. The language is case-insensitive.

Option B) Multiple instructions can be coded on 1 line, as long as they are separated by a ',' - This option is incorrect. In REXX, multiple instructions cannot be coded on a single line by separating them with a ','. Each instruction should be written on a separate line.

Option C) A REXX program should start with a comment clause /* REXX / - This option is correct. It is a good practice to start a REXX program with a comment clause / REXX */ to indicate that it is a REXX program.

Option D) Continuation of REXX instructions is achieved by using a ',' as a continuation indicator - This option is correct. In REXX, you can use a ',' as a continuation indicator to continue a statement onto the next line.

The correct answer is B. Multiple instructions cannot be coded on 1 line, as long as they are separated by a ','. This statement is not correct in a REXX program.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) all blanks - This option is incorrect because the initial value of a variable in REXX is not all blanks. The initial value will be determined by the assignment or the default value of the data type.

Option B) NULL value - This option is incorrect because REXX does not have a specific NULL value. The initial value of a variable will be determined by the assignment or the default value of the data type.

Option C) name of the variable in the same (mixed) case as the name - This option is incorrect because the initial value of a variable in REXX is not based on the variable name itself. The initial value will be determined by the assignment or the default value of the data type.

Option D) name of the variable in uppercase - This option is correct because when defining a variable in REXX, the initial value will be the name of the variable in uppercase. This means that the variable will initially have the same value as its name, but in uppercase.

The correct answer is D) name of the variable in uppercase. This option is correct because the initial value of a variable in REXX is the name of the variable in uppercase.

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• Wrong explanation

To determine which of the given REXX expressions will generate an error, let's go through each option:

A. 10 / number1 - This expression will generate an error because number1 has not been assigned a value. It is attempting to perform division with an undefined variable.

B. name || 'number2' - This expression will concatenate the value of the variable name with the string 'number2'. It will not generate an error.

C. number2 * 3 - This expression will multiply the value of the variable number2 by 3. It will not generate an error.

D. name > number2 - This expression will compare the value of the variable name with the value of the variable number2. It will not generate an error.

Therefore, the correct answer is A. This expression will generate an error because number1 has not been assigned a value.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) output on the terminal: result = 2 3 5 - This option is incorrect because the program will not reach this line of code. The correct answer indicates that the program will terminate with an error.

Option B) output on the terminal: result = 3 2 1 - This option is incorrect because the program will not reach this line of code. The correct answer indicates that the program will terminate with an error.

Option C) output on the terminal: result = var_3 var_4 var_5 - This option is incorrect because the program will not reach this line of code. The correct answer indicates that the program will terminate with an error.

Option D) the program will terminate with an error - This option is correct because the program encounters an error in the IF-THEN-ELSE statement. The condition "var_1 = var_2" evaluates to false, so the program executes the statements in the ELSE block. However, there is no statement to assign values to the variables var_3, var_4, and var_5 in the ELSE block. Therefore, the program will terminate with an error.

The correct answer is D. The program will terminate with an error.

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• Wrong explanation

To answer this question, you need to understand the TRUNC function.

The TRUNC function is used to truncate a number to a specified number of decimal places. It removes all decimal places beyond the specified number without rounding the number.

In this case, the TRUNC(12.3456, 3) means truncating the number 12.3456 to 3 decimal places.

Let's evaluate each option:

Option A) 12.3 - This option is incorrect because it only has one decimal place, while the TRUNC function truncates the number to 3 decimal places.

Option B) 12.3000 - This option is incorrect because it has four decimal places, while the TRUNC function truncates the number to 3 decimal places.

Option C) 12.346 - This option is incorrect because it has three decimal places, while the TRUNC function truncates the number to 3 decimal places and removes the decimal places beyond that.

Option D) 12.345 - This option is correct because it has three decimal places, which matches the result of the TRUNC(12.3456, 3) function.

Therefore, the correct answer is D) 12.345.

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• Wrong explanation