单选题
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 ( ) 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 (请作答此空)architectures are programs written in the Unix shell.
Aevent-based
Bobject-oriented
Cpipe-and-filter
Dlayered
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