What is the output of this program?

#include<stdio.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<semaphore.h>
 
int main()
{
    sem_t* sem_id;
    int value;
    sem_id = sem_open("sem_value",O_CREAT,0666,0);
    if(sem_id == SEM_FAILED)
        perror("sem_open");
    if(sem_getvalue(sem_id,&value) == -1)
        perror("sem_getvalue");
    printf("%d\n",value);
    sem_wait(sem_id);
    printf("Examveda\n");
    if(sem_close(sem_id) == -1)
        perror("sem_close");
    return 0;
}

A. 0

B. Examveda

C. Both 0 and Examveda

D. None of the mentioned

Answer: Option A