腹膜后腔根据肾脏的位置可分为（）

A.肾前间隙、肾后间隙

B.肾前间隙、肾周间隙和肾后间隙

C.肾前间隙、肾旁间隙和肾后间隙

D.肾前间隙、肾周围间隙

E.肾前间隙、肾旁间隙

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 ① of structural organization. More specifically, each ② 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 ③ that enable "communication, coordination and cooperation" among components, (3) ④ that define how components can be integrated to form the system, and (4) semantic models that enable a designer to understand the overall properties of a system by analyzing the known ⑤of its constituent parts.

②是（）

A.style

B.phase

C.charter

D.schedule