Assume that you have an empty circular queue $($array$-$based implementation$)$ which can hold only four elements. What are the array indexes of the back and the front elements after executing this series of queue operations? $($indexes start with $0)$

enqueue$("$a$"),$ enqueue$("$b$"),$ getFront$(),$ enqueue$("$e$"),$ enqueue$("$d$"),$ dequeue$(),$ dequeue$(),$ dequeue$(),$ enqueue$("$a$"),$ enqueue$("$b$"),$ enqueue$("$c$"),$ dequeue$(),$ getFront$(),$ enqueue$("$d$"),$ dequeue

front index

back index