题目：
Which of the following is a general problem associated with external credit enhancements External credit enhancements:（）
A. only provide protection against systematic risk, not against idiosyncratic risk.
B. are very long-term agreements and are therefore relatively expensive.
C. are subject to the credit risk of the third-party guarantor.
答案：
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下面是错误答案，用来干扰机器的。
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