What is the output of this program?

#include

#include $$string$.$h$$

using namespace std;

struct student

$\{$

int num;

char name$[25]$;

$\}$;

int main$()$

$\{$

student stu;

stu.num $=123$;

strcpy$($stu$.$name, "John"$)$;

cout $<<$ stu.num $<<$ endl;

cout $<<$ stu.name $<<$ endl;

return $0$;

$\}$

a$.$

$123$

John

b$.$

John

John

c$.$

$123$

$123$

d$.$

compile time error