Consider the given insert and delete functions. Assume that the QUEUE$\_$SIZE is $10.$ Which of the following cannot be replaced with if$($IsQueueEmpty$($c$))$ in the remove function to maintain the same functionality?

void insert$($struct Queue $*c,$ int $x)$

$\{$

if$($c$->$rear $==$ QUEUE$\_$SIZE$-1)$

$c$ rear $=0$;

else

$($c$->$rear$)++$ ;

if$($isQueueFull$($c$))$

cout$$"Overflow: Queue is full"$$