Which of the following is the correct output for the program

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Which of the following is the correct output for the program given below?

#include <stdio.h>
int main ( )
{
    int a, b, c;
    a = b = c = 1;
    c = ++a || ++b && ++c;
    printf ( "a = %d b = %d c = %d\n", a , b,  c);
    return 0;
}

1. a = 2 b = 1 c = 1
2. a = 2 b = 2 c = 2
3. a = 2 b = 2 c = 1
4. a = 1 b = 2 c = 1

Correct Option: A

For given statement c = ++a || ++b && ++c;
only ++a will be evaluated so the output will be
a = 2
b =1
c = 1