What XXX will generate the following output? Enter a value: $0$ was not found.

public class BinarySearch $\{$

public static int binarySearch$($int $[]$ list, int listSize, int key$)\{$

int mid;

int low;

int high;

low $=0$;

high $=$ listSize $-1$;

while $($high $>=$ low$)\{$

mid $=($high $+$ low$)/2$;

if $($list$[$mid$]<$ key$)\{$

low $=$ mid $+1$;

$\}$

else if $($list$[$mid$]>$ key$)\{$

high $=$ mid $-1$;

$\}$

else $\{$

return XXX;

$\}$

$\}$

return $-1$;

$\}$

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

Scanner scnr $=$ new Scanner$($System$.$in$)$;

int $[]$ list $=\{2,4,7,10,11,32,45,87\}$;

final int listSize $=8$;

int i;

int key;

int keyIndex;

System.out.print$("$Enter a value: $")$;

key $=$ scnr$.$nextInt$()$;

keyIndex $=$ binarySearch$($list$,$ listSize, key$)$;

if $($keyIndex $==-1)\{$

System.out.println$($key $+"$ was not found."$)$;

$\}$

else $\{$

System.out.println$("$Found $"+$ key $+"$ at index $"+$ keyIndex $+".")$;

$\}$

$\}$

$\}$

a$.$

low

b$.$

mid

c$.$

high

d$.$

$-1$