When is int_flag set to TRUE?

When is int_flag set to TRUE?
A . when the DEFER INTERRUPT statement is executed
B . only at program initialization by an INFORMIX-4GL library
C . in a user-defined error handler executed when the user presses the interrupt key when prompted for input
D . when the user presses the interrupt key when prompted for input and the DEFER INTERRUPT statement has been executed

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Answer: D