What is the output of this program?

#include<stdio.h>
#include<sys/socket.h>
int main()
{ 
    int ret;
    ret = shutdown(0,0);
    printf("%d\n",ret);
    return 0;
}

A. countw B. wcount C. wc D. count p E. None of the above

A. dm B. rm C. delete D. erase E. None of the above

A. rdir B. remove C. rd D. rmdir E. None of the above

A. x B. y C. a D. z E. None of the above