What is a precaution an Administrator should take before beginning an upgrade of IBM Security QRadar SIEM V7.2.8?

What is a precaution an Administrator should take before beginning an upgrade of IBM Security QRadar SIEM V7.2.8?
A. Close all open offenses.
B. Purge old data and events.
C. Check and close all open messages.
D. Confirm that a backup of the data is complete.

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