An architectural Style defines as a family of such systems in terms of a （ ）of structural organizati

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 （请作答此空） 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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