What is the output of this program?

#include<stdio.h>

int main()
{
    int fd_socket;
    fd_socket = socket(AF_UNIX,SOCK_STREAM,0);
    printf("%d\n",fd_socket);
    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