NO.PZ2023040401000019
问题如下：
An interest rate swap is a derivative contract in which:
选项：
A.
two parties agree to exchange a series of cash flows.
B.
the credit seller provides protection to the credit buyer.
C.
the buyer has the right to purchase the underlying from the seller.
解释：
A is correct. An interest rate swap is defined as a derivative in which two parties agree to exchange a series of cash flows: One set of cash flows is variable, and the other set can be variable or fixed.
B is incorrect because a credit derivative is a derivative contract in which the credit protection seller provides protection to the credit protection buyer. C is incorrect because a call option gives the buyer the right to purchase the underlying from the seller.
选项C是什么意思，描述的是哪类？
