单选题Which of the following is true about job chains？（）AThey consist of one or more Scheduler programs.BThey are used to implement dependency scheduling.CThey are used to implement time-based scheduling.DThey are used to implement event-based scheduling.ENo
题目
单选题
Which of the following is true about job chains？（）
A
They consist of one or more Scheduler programs.
B
They are used to implement dependency scheduling.
C
They are used to implement time-based scheduling.
D
They are used to implement event-based scheduling.
E
None of the above.