啥是双边清算

问题如下：

Which of the following statement is most appropriate?

选项：

A.

Initial margin is a unique requirement in central cleaning.

B.

Variation margin is a unique requirement in central cleaning.

C.

Both initial margin and variation margin are unique requirements in central cleaning.

D.

Like central cleaning, bilateral clearing can also require initial margin and variation margin.

解释：

D is correct.

考点：initial margin and variation margin

解析：initial margin和variation margin不是central cleaning特有的。bilateral clearing也可以要求投资者缴纳initial margin和variation margin。