What will be the output of the following C code?#include

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What will be the output of the following C code?

#include <stdio.h>
    union
    {
        int n;
        char ch;
    }U;
    int main()
    {
        U.n = 10;
        printf("%d\n", sizeof(U));
    }

1. sizeof(int)
2. Depends on the compiler
3. sizeof(int) + sizeof(char)
4. Compilation Error
5. None of these

Correct Option: A

sizeof(int)