Which task would you recommend before using the Database Upgrade Assistant (DBUA) to upgrade a singleinstance Oracle 11g R2 database to Oracle Database 12c?
A.
shutting down the database instance that is being upgraded
B.
executing the catctl.pl script to run the upgrade processes in parallel
C.
running the Pre-Upgrade Information Tool
D.
copying the listener.ora file to the new ORACLE_HOME