To analyze the given program fragment, let's go through each option:

Option A) The program has a syntax error because the required break statement is missing in the switch statement. This option is incorrect because the absence of a break statement is not a syntax error. However, it can lead to unexpected behavior in the program, such as falling through to the next case.

Option B) The program has a syntax error because the required default case is missing in the switch statement. This option is incorrect because the absence of a default case is not a syntax error. A default case is optional and is executed when none of the cases match the switch control variable.

Option C) The switch control variable cannot be double. This option is correct. In C, the switch control variable can only be an integer type (char, int, long, enum). It cannot be a floating-point type like double. Therefore, this program fragment would result in a compilation error.

Option D) No errors. This option is incorrect because, as mentioned earlier, the program fragment would result in a compilation error due to using a double as the switch control variable.

Therefore, the correct answer is C) The switch control variable cannot be double.

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

Option A) 5 - This option is incorrect because the loop will continue until the value of item is 5, and the sum at that point will be 6.

Option B) 6 - This option is correct. Let's break down the loop execution:

• Initially, sum is 0 and item is 0.
• In the first iteration, item is incremented to 1, and sum is updated to 1.
• In the second iteration, item is incremented to 2, and sum is updated to 3 (1 + 2).
• In the third iteration, item is incremented to 3, and sum is updated to 6 (3 + 3).
• Since sum is now greater than 4, the loop terminates.

Option C) 7 - This option is incorrect because the loop terminates when the sum is greater than 4, which happens at sum = 6 as explained above.

Option D) 8 - This option is incorrect because the loop terminates when the sum is greater than 4, which happens at sum = 6 as explained above.

The correct answer is B) 6. This option is correct because the loop terminates when the sum is greater than 4, and at that point, the sum is 6.

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To answer this question, you need to understand the purpose of a validator control in web development.

A validator control is used to validate user input on a web form. It checks whether the input matches certain criteria, such as a required field, a specific format, or a range of values. In order for the validation to work correctly, you need to specify the control that should be validated.

The correct attribute that must be set on a validator control for the validation to work is:

D) ControlToValidate

The ControlToValidate attribute is used to specify the ID of the control that needs to be validated. This attribute tells the validator control which input field to check for validation.

Option A) Validate - This option is incorrect because there is no attribute called "Validate" associated with a validator control. Option B) ValidateControl - This option is incorrect because there is no attribute called "ValidateControl" associated with a validator control. Option C) ControlToBind - This option is incorrect because there is no attribute called "ControlToBind" associated with a validator control.

Therefore, the correct answer is D) ControlToValidate. This attribute needs to be set on a validator control to specify the control that needs to be validated.

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To protect the view state from tampering when it's passed over an unencrypted channel, you can enable the ViewStateMac (Message Authentication Code) by setting the EnableViewStateMac attribute to "true" in the Page directive.

Let's go through each option to understand why it is correct or incorrect:

Option A) In Page directive set EnableViewStateMac="true" - This option is correct because enabling the ViewStateMac adds a MAC to the view state, which ensures its integrity and prevents tampering. The MAC is checked on the server-side when the view state is received, and if it doesn't match, an exception is thrown.

Option B) In Register directive set EnableViewStateMac="true" - This option is incorrect because the Register directive is not used for enabling the ViewStateMac. It is used for registering custom server controls on the page.

Option C) In web config set Protectviewstate="true" - This option is incorrect because the Protectviewstate attribute in the web.config file is used to enable or disable view state encryption, not MAC protection. Enabling view state encryption ensures that the view state data is encrypted before being sent to the client.

Option D) In IIS set ViewState protection - This option is incorrect because there is no specific ViewState protection setting in IIS. ViewState protection is implemented at the application level, usually within the application code or configuration.

The correct answer is A) In Page directive set EnableViewStateMac="true". This option is correct because enabling the ViewStateMac in the Page directive adds a MAC to the view state, ensuring its integrity and preventing tampering.

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• Wrong explanation