（216）Which three elements can a job chain process involve?(Choose three)

A. an event

B. a schedule

C. a program

D. another chain

E. a lightweight job

答案：（B、C、D）

解析：

《Administrator's Guide》 29.6.3

After creating a chain object,you define one or more chain steps.Each step can point to one of the following:

A Scheduler program object

Another chain(a nested chain)

An event schedule,inline event,or file watcher