Which three options are mandatory procedures to consider in migration planning? (Choose three.)

[answerhappygod]

Which three options are mandatory procedures to consider in migration planning? (Choose three.)

A. Lock all the configuration data in the test environment.
B. Review all the customizations and configuration performed in the test environment.
C. Define which data should be migrated from the test environment.
D. Check if there are no configuration records at all in the production environment. E. Verify if both environments are in the same release and patch bundle.