What are some of the required customer activities to maintain their SAP S/4HANA Cloud system post go-live?

What are some of the required customer activities to maintain their SAP S/4HANA Cloud system post go-live?
A . Activate new scope (if applicable)
B . Conduct regression testing on business processes
C . Maintain business catalogs
D . Stay current
E . Test new features in the Stay Current Early Knowledge Enablement Sandbox / Trial environment

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Answer: A,B,C