What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<sys/mman.h>
 
int main()
{
    int s_id;
    s_id = shm_open("shared_mem",O_CREAT|O_RDWR,0666);
    printf("%d\n",s_id);
    if(shm_unlink("shared_mem") == -1)
        perror("shm_unlink");
    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