What will be the output of the following C code?

#include <stdio.h>
struct student
{
    char a[];
};
void main()
{
    struct student s;
    printf("%d", sizeof(struct student));
}

A. struct B. record C. class D. object

A. Variables B. Properties C. Objects D. Elements

A. Function B. Another structure C. Enumeration D. All of the above

A. . (dot) B. -> (arrow) C. :: (scope) D. , (comma)