Q. What is the output of C Program with pointers?

int main()
{
    int a=10;
    int *p, **q;
    p=&a;
    q=&p;
    printf("%d ", a);
    *p=15;
    printf("%d ", a);
    **q=20;
    printf("%d ", a);
    return 0;
}

• (A) 10 10 10
• (B) 10 0 0
• (C) 10 15 20
• (D) Compiler error