Which of the following are the MAIN reasons why a systems administrator would install security patches in a staging environment before the patches are applied to the production server? (Choose two.)

Which of the following are the MAIN reasons why a systems administrator would install security patches in a staging environment before the patches are applied to the production server? (Choose two.)
A . To prevent server availability issues
B . To verify the appropriate patch is being installed
C . To generate a new baseline hash after patching
D . To allow users to test functionality
E . To ensure users are trained on new functionality

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Answer: AD