长度为N的数组空间中，存放着一个循环队列，该队列的队头和队尾指示器分别为front和rear，则该队列中的元素个数为（）。

A.rear-front

B.(rear-front)%N

C.(rear-front+N)%N

D.(rear-front+1)%N

A.(rear-front+1)%N

B.(rear-front+N)%N

C.rear-front

D.(rear-front)%N

A.5

B.6

C.16

D.17

A.front == rear

B.front != rear

C.front == (rear+1) % m0

D.front != (rear+1) % m0

A.rear==(front+1) % m0

B.rear==(rear+1) % m0

C.rear==(front+1)

D.rear==(rear+1)

A.(rear+1)%n == front−1

B.(rear+1)%n == front

C.(rear)%n == front

D.rear+1 == front

A.front==rear

B.front==0

C.rear==0

D.front=rear+1