.In which two situations can you use

多选题 .In which two situations can you use Database Upgrade Assistant?

A、 when the operating system(OS)needs to be changed as part of the upgrade

B、 when multiple pluggable databases in a container database have to be upgraded in a specific Sequence

C、 when the hardware platform needs to be changed as part of the upgrade

D、 when a character set conversion is required during the upgrade

E、 when the target and source database are on the same platform

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