What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
 
struct data_st{
    long int id;
    char buff[11];
};
int main()
{
    int m_id,ret;
    struct data_st data1, data2;
    m_id = msgget((key_t)181,0666|IPC_CREAT);
    if(m_id == -1)
        perror("msgget");
    data1.id = 1;
    strcpy(data1.buff,"Example");
    if(msgsnd(m_id,&data1,11,0) == -1)
        perror("msgsnd");
    ret = msgrcv(m_id,&data2,11,1,0);
    printf("%d\n",ret);     
    if(msgctl(m_id,IPC_RMID,0) != 0)
        perror("msgctl");
    return 0;
}

A. 0

B. -1

C. 1

D. 11

Answer: Option D