What is the output of the following program on GCC compiler?

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Choose the correct option.

What is the output of the following program on GCC compiler?

#include  
int main() {
static int a=5;
printf("%d",a--);
if(a)
main();
return 0;
}

 

A. 43210
B. 12345
C. 55555
D. 54321