营业机构柜员劳动组合必须坚持不相容业务操作岗位分设，做到相互制约、相互控制，这就要求（）

A.印.证分管.分用

B.联行类业务的录入.确认必须双人办理

C.事后监督岗兼办柜台业务

D.客户经理负责本人管理的账户对账单据的发送和回收

The (29) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several (30) 。

29（）

A. waterfall model     

B. workflow reference model

C. evolutionary model

D. spiral model