What is the output of this program?

#include<stdio.h>
 
int main()
{
    if (mkfifo("/tmp/test_fifo",0666) != 0)
        perror("mkfifo");
    if (mkfifo("/tmp/test_fifo",0666) != 0)
        perror("mkfifo");
    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