If DEFER INTERRUPT is set at the beginning of the application, why must your application set int_flag to FALSE before an INPUT statement is executed?

If DEFER INTERRUPT is set at the beginning of the application, why must your application set int_flag to FALSE before an INPUT statement is executed?
A . The interrupt key will be disabled until int_flag is set to FALS
C . The application will immediately exit if the user presses the interrupt key.
D . An error will occur if int_flag is not reset to FALSE and the user presses the interrupt key.
E . The application will not be able to determine if the user presses the interrupt key if int_flag is not reset to FALS

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Answer: D