题目：
An architectural style defines as a family of such systems in terms of a (1) of structural organization. More specifically, an architectural style defines a vocabulary of (2) and connector types, and a set of (3) on how they can be combined. For many styles there may also exist one or more (4) that specify how to determine a system's overall properties from the properties of its parts. Many of architectural styles have been developed over the years. The best-known examples of (5) architectures are programs written in the Unix shell.
空白（3）处应选择（）
A.functions
B.code segments
C.interfaces
D.constraints
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A, B, C, E解析：实物期权类型归结为五大类，即等待投资型期权、成长型期权、放弃型期权、柔性期权、学习型期权。
