题目：
Which of the following statements about the relationship between the value of a callable bond, the value of an option-free bond, and the value of the embedded call option is TRUE（）
A. Value of a callable bond=present value of the interest payments +present value of the principal at maturity.
B. Value of a callable bond=value of an option-free bond + value of an embedded call option.
C. Value of a callable bond=value of an option-free bond-value of an embedded call option.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
，AD=4，则四边形ABCD的面积是
