The RVPC user can do which of the following？（）
A. Register databases if granted the register database privilege
B. See all databases in the recovery-catalog schema
C. See all database-related metadata in the recovery catalog if they are granted access to that database
D. Unregister databases from the RVPC catalog that were not granted to the RVPC catalog owner with the grant command
E. Not be connected to with the RMAN command-line catalog parameter for backup or recovery purpose
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