What will be the output of the following C code on a 64

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What will be the output of the following C code on a 64 bit machine?

#include <stdio.h>
    union Stir
    {
        int num;
        char ch;
    };
    int main()
    {
        union Stir str;
        printf("%d", sizeof(str));
        return 0;
    }

1. str
2. Compilation Error
3. 4
4. All of above
5. None of these

Correct Option: C

Since the size of a union is the size of its maximum data type, here int is the largest data type. Hence the size of the union is 4.