What is the output of this program?

#include<stdio.h>
#include<unistd.h>
 
int main()
{
    pid_t child;
    child = fork();
    printf("%d\n",child);
    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