What will be the output of the following program on GCC compiler?

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โœช Choose the correct option.

What will be the output of the following program on GCC compiler?

#include   
int main() {
int show();
int (*f)();
f=show;
printf("address=%d ",f);
(*f)();
return 0;
}
int show(){
printf("Hello World ");
return 0;
}

A. Garbage value
B. NULL
C. NULL
D. compiler error