In a queue when the last$\_$ix $($pointing to the last element added to the queue$),$ comes up right behind the first$\_$ix $($e$.$g$.$ last$\_$ix $==$ first$\_$ix$-1),$ this is an indication that the queue is:

Group of answer choices

empty

full

this situation can never happen

it really doesn't tell us anything $-$ it is just one of many arrangements of first$\_$ix and last$\_$ix