The （1） 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 （2）.
（1）A. waterfall model
B. workflow reference model
C. evolutionary model
D. spiral model
（2）A. workflow engines
B. processes
C. workflow threads
D. tasks
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