Oracle Database 12c Advance Adminstration1z0-063 Test 4

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What is the benefit of running the catctl.pl script during an upgrade of a pre-12c database to an Oracle 12c database?

It generates a log file containing the fixes that can be made to the source database.
It recompiles all invalid PLSQL and Java code.
It provides parallel upgrade options to finish the upgrade process with a reduced down time.
It provides a summary of the upgrade results.
It generates fixup scripts to be run on the source database before upgrade.

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