题目内容：
An architectural Style defines as a family of such systems in terms of a （ ）、of structural organization. More specifically an architectural style defines a vocabulary of（ ） and connector types, and a set of （ ）on how they can be combined. For many styles there may also exist one or more（此空作答） 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 （ ）architectures are programs written in the Unix shell．
A.semantic models
B.weak entities
C.data schemas
D.business models
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