The CalcEq subroutine below evaluates the equation: $($x $+$ y$)*$ z$.$

Values for x$,$ y$,$ and z are passed to the subroutine as arguments.

Which register is used for the argument z$?$

CalcEq:

add $t$5,$ $t$1,$ $t$2$

mul $t$6,$ $t$5,$ $t$0$

jr $ra

Group of answer choices

$t$2$

$t$1$

$t$0$

$t$3$

$ra

$t$6$