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Structures, Unions, Enums - Programming

Q1:

What will be the output of the program ? 
#include<stdio.h>

int main()
{
    union a
    {
        int i;
        char ch[2];
    };
    union a u;
    u.ch[0]=3;
    u.ch[1]=2;
    printf('%d, %d, %d\n', u.ch[0], u.ch[1], u.i);
    return 0;
}

A 3, 2, 515

B 515, 2, 3

C 3, 2, 5

D 515, 515, 4

ANS:A - 3, 2, 515

The system will allocate 2 bytes for the union. The statements u.ch[0]=3; u.ch[1]=2; store data in memory as given below.