Which of the following is NOT considered a reason for using the swaps market To:()

A. reduce transactions costs and obtain cheaper financing. 

B. exploit market inefficiencies. 

C. maintain privacy.

假设为循环队列分配的向量空间为Q[20]，若队列的长度和队头指针值分别为13和17，则当前尾指针的值为 【1】 。