Consider the following operations performed on a Queue Q that is initially empty $($i$.$e$.$ it has no elements, like an empty queue for student hours$).$

Q$.$add$($b$)$

Q$.$add$($c$)$

Q$.$add$($a$)$

Q$.$remove$()$

Q$.$add$($c$)$

Q$.$add$($d$)$

This has produced a modified queue Q$.$

Match each of the following operations on this modified queue Q to their output. $($That is$,$ consider each of the following operations as the seventh operation after the six above; they are themselves not cumulative.$)$

Q$.$remove$()$

q$.$size$()$