Choose three. Which three are true about using Database Upgrade Assistant (DBUA) to upgrade a database?
DBUA must be launched from the target Oracle Home.
Multiple databases with the same ORACLE_HOME can be upgraded simultaneously.
A whole database backup must exist before upgrade.
The Pre-Upgrade Information Tool script is executed by DBUA.
All pluggable databases are automatically upgraded as part of a container database upgrade.
The database must be opened in read-only mode.
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