$2.(10$ pts$.)$ Given the following code:

$```$

int z $=7$;

int k $=2$;

public void f$($int x$,$ int y$)\{$

int k $=8$;

y $=$ k;

$\}$

z $=$ y $*$ k;

public static void main$($String$[]$ args$)\{$

f$($z$,$ k$)$;

System.out.println$($z$)$;

$\}$

System.out.println$($k$)$;

$```$

what would the output be if the parameters were passed using a$.$ call by value?

b$.$ call by reference?

c$.$ call by value$-$result?

d$.$ call by macro expansion?