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;
    int *ptr;
    s_id = shm_open("shared_mem",O_CREAT|O_RDWR,0666);
    if(s_id == -1)
        perror("shm_open");
    ptr = mmap(NULL,100,PROT_WRITE,MAP_PRIVATE,s_id,0);
    if(ptr == MAP_FAILED);
        perror("mmap");
    if(munmap(ptr,100) == -1)
        perror("munmap");
    if(shm_unlink("shared_mem") == -1)
        perror("shm_unlink");
    return 0;
}

A. mmap: Success

B. mmap: Failure

C. munmap: Success

D. munmap: Failure

Answer: Option A