A.Running DBMS_PDB.DESCRIBE followed by a metadata-only export

B.Opening the PDB in UPGRADE mode and running catctl.pl scripts

C.Dropping and recreating all application schemas manually

D.Changing COMPATIBLE parameter in init.ora and restarting CDB

A.The PDB opens only for read-only transactions and remains in that mode permanently

B.The PDB cannot open unless an instance parameter is modified

C.The PDB opens in read-write mode and remains open permanently

D.The PDB opens in read-write mode but returns to MOUNT state on CDB restart

A.PDB states are persisted automatically without explicit SAVE STATE

B.Dropping a PDB can optionally keep its datafiles for reuse

C.MOUNT is the default state when a PDB is created

D.PDB$SEED can be opened in READ WRITE mode for patching

A.Flashback Table disables redo log application; Flashback Database enforces redo consistency

B.Flashback Table reverts the entire database; Flashback Database affects a specific table

C.Flashback Table operates at the object level; Flashback Database rewinds the entire database instance

D.Flashback Table requires archive logs; Flashback Database uses only undo data

A.AWR snapshots

B.LogMiner sessions

C.Database instances

D.ASM instances