A为啥不对

问题如下：

In a bilaterally cleared derivatives transaction between two companies (Company A and Company B), Company B defaults. The value for Company A is a positive $60,000 and the collateral posted by Company B is $20,000. In this situation, Company A is a(n):

选项：

A.

secured creditor in the amount of $20,000

B.

secured creditor in the amount of $40,000

C.

unsecured creditor in the amount of $20,000

D.

unsecured creditor in the amount of $40,000

解释：

The total value for Company A (as the nondefault party) is positive, and at $60,000, it exceeds the $20,000 collateral posted by Company B (as the default party). Company A will be an unsecured creditor for an amount equal to $60,000 − $20,000 = $40,000.