Following is the source code of a simple C$++$ program. It contains a user$-$defined function demoFunction$().$ In the user$-$defined function, two variables an and b are declared and initialized by x and y$,$ where x and y are not variables, they represent two integers. In main$(),$ the function demoFunction$()$ is called twice.

#include

using namespace std;

int demoFunction$($void$)$

$\{$

static int a$=$x;

int b$=$y;

a$+=10$;

b$+=10$;

return a;

$\}$

int main$()$

$\{$

int m$,$ n;

m$=$demoFunction$()$;

n$=$demoFunction$()$;

return $0$;

$\}$

Select the correct statement from the followings:

Group of answer choices

The values of m and n will be different

The values of m and n will be the same

The value of n will be x$+10$

The value of m will be x$+20$