What is the output of the following program?

#include

using namespace std;

void func$($int &x$,$ int y$)$

$\{$

x $=$ x $-$ y;

y $=$ x $*10$;

$\}$

int main$()$

$\{$

int value $=7$;

func $($value$,$ value$)$;

cout $<<$ value $<<","<<$ value $<<\text{'}$

$\text{'}$;

return $0$;

$\}$

a$.$

$7,70$

b$.$

$7,0$

c$.$

$0,0$

d$.$

$0,70$