What do you have to ensure during the downtime phases of SUM? There are 3 correct answers to this question.

What do you have to ensure during the downtime phases of SUM? There are 3 correct answers to this question.
A . The source database must be stopped
B . End users can not log on to the SAP system
C . Batch jobs from daily business can not start
D . Interfaces from other SAP systems can not log on to the SAP system

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Answer: B,C,D