题目：
The（）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（）. In a workflow system, a process is specified using the process definition tool. Usually, processes are defined in terms of a（）, which consists of（）indicated using a circle, and（）shown as a rectangle. These two components can be linked by means of a directed arc.
The（）is a general description of the architecture of a workflow management system used by the WFMC
A．waterfall model
B．workflow reference model
C．evolutionary model
D．spiral model
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
