循环队列是空队列的条件是( )。
AQ - > rear = = Q - > front
B(Q - > rear + 1)%maxsize = = Q - > front
CQ - > rear = = 0
DQ - > front = = 0
AQ - > rear = = Q - > front
B(Q - > rear + 1)%maxsize = = Q - > front
CQ - > rear = = 0
DQ - > front = = 0