题目内容
（请给出正确答案）
[单选题]
A.Selection, projection, join
B. Difference, projection, join
C. Selection, intersection, join
D. Intersection, projection, join
E. Difference, projection, product
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A. A job chain can contain a nested chain of jobs.
B. The jobs in a job chain cannot have more than one dependency.
C. A job of the CHAIN type can be run using event-based or time-based schedules.
D. The jobs in a job chain can be executed only by using the events generated by the Scheduler
