单项选择题Your multitenant container database, CDB1, is running in ARCHIVELOG mode and has two pluggable databases, HR_PDB and ACCOUNTS_PDB.An RMAN backup exists for the databasE.You issue the command to open ACCOUNTS_PDB and find that the USERDATA.DBF data file for the default permanent tablespace USERDATA belonging to ACCOUNTS_PDB is corrupteD.What should you do before executing the commands to restore and recover the data file in ACCOUNTS_PDB?()A.Place CDB1 in the mount stage and then the USERDATA tablespace offline in ACCOUNTS_PDB.B.Place CDB1 in the mount stage and issue the ALTER PLUGGABLE DATABASE accounts_pdb CLOSE IMMEDIATE commanD.C.Issue the ALTER PLUGGABLE DATABASE accounts_pdb RESTRICTED commanD.D.Take the USERDATA tablespace offline in ACCOUNTS_PDB.
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