What is the output of this program

#include<stdio.h>
#include<pthread.h>
 
void *fun_t(void *arg);
void *fun_t(void *arg)
{
    pthread_exit("Bye");    
}
int main()
{
    pthread_t pt;
    void *res_t;
    int ret;        
    ret = pthread_join(pt,&res_t);
    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