What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
 
int main()
{
    int fd[2];
    int child;
    char buff[6];
    if(pipe(fd) != 0)               
        perror("pipe");
    child=fork();
    switch(child){
        case -1 :
            perror("fork");
            exit(1);
        case 0 :
            if (write(fd[1],"Linux",6) != 6)
                perror("write");
                break;
            default :
                read(fd[0],buff,6);
                printf("%s\n",buff);
                break;
    }
    return 0;
}

A. this program will print the string "Linux"

B. this program will print nothing

C. segmentation fault

D. none of the mentioned

Answer: Option A