单选题 Representations of software architecture are an enabler for communication between all parties (stakeholders) interested in the development of a computer-based system. An architectural style defines as a family of such systems in terms of a ______ of structural organization. More specifically, each ______ describes a system category that encompasses: (1) a set of components(e.g. , a database, computational modules) that perform a function required by a system, (2) a set of ______ that enable "communication, coordination and cooperation" among components, (3)　______ that define how components can be integrated to from the system, and (4) semantic models that enable a designer to understand the overall properties of a system by analyzing the known ______ of its constituent parts.