What is the output of the following code, given the function definition below?

int a $=7,$ b $=12$;

tester $($a$,$ b$)$;

cout $<<$ a $<<<<$ b;

void tester $($int m$,$ int &n$)//$ function definition

$\{$

n $=$ n $-2*$ m;

m $=2*$ m;

$\}$

Group of answer choices

$14-2$

$7-2$

$1412$

$712$