To understand the default compiler options with respect to subscript out of range checking, let's go through each option:

Option A) SSRANGE - This option is incorrect because SSRANGE is not the default compiler option for subscript out of range checking. It enables runtime checking of subscript ranges.

Option B) NOSSRANGE - This option is correct because NOSSRANGE is the default compiler option for subscript out of range checking. It disables runtime checking of subscript ranges.

Option C) RANGE - This option is incorrect because RANGE is not a valid compiler option for subscript out of range checking.

Option D) None of the above - This option is incorrect because the correct option is B) NOSSRANGE.

The correct answer is B) NOSSRANGE. This option is correct because it is the default compiler option for subscript out of range checking, disabling the runtime checking of subscript ranges.

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To answer this question, we need to understand the concept of redefining fields in COBOL.

In COBOL, redefining a field means using the same storage area for two or more different data items. The redefined fields must be of the same size or smaller than the original field.

In this case, we are considering redefining an X(10) field with a field of X(20). Since the redefined field is larger (X(20)) than the original field (X(10)), this is not allowed. Redefining a field with a larger field size would result in data loss or truncation.

Therefore, the correct answer is:

B. False - We cannot redefine an X(10) field with a field of X(20).

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To answer this question, you need to understand the different data types and their ranges.

Option A) System.UInt16 - This option is correct because UInt16 is an unsigned 16-bit integer data type in C#, which means it can only store positive numbers. It has a range of 0 to 65,535, which satisfies the given criteria.

Option B) int - This option is incorrect because an int is a signed 32-bit integer data type in C#, which means it can store both positive and negative numbers. It has a larger range from -2,147,483,648 to 2,147,483,647, which exceeds the given criteria.

Option C) System.String - This option is incorrect because a string is not a numeric data type. It is used to store text and not numbers.

Option D) System.IntPtr - This option is incorrect because IntPtr is a platform-specific pointer data type and not a numeric data type. It is used to store memory addresses.

The correct answer is Option A) System.UInt16. This option is correct because it is an unsigned 16-bit integer data type in C# that meets the given criteria of always being a number and not being greater than 65,535.

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