When planning an SAP system upgrade what are steps to consider (More than one answers are true)

When planning an SAP system upgrade what are steps to consider (More than one answers are true)
A . Adaptation and testing of customer enhancements
B . End-user training
C . Modification adjustment and migration of modifications into SAP standard
D . Adaptation and testing of interfaces
E . Release Customizing
F . Validation and testing of new releases

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Answer: A,C,D,E,F