I have implemented the queue with a circular array, keeping track of first, last, and count $($the number of items in the array$).$ Suppose first is zero, and last is CAPACITY$-1.$ What can you tell me about count. Question $1$ Answer a$.$ count must be zero. b$.$ count must be CAPACITY. c$.$ count could be zero or CAPACITY, but no other values could occur. d$.$ None of the above. choose the valid answer