Which three actions are required to manually upgrade a database to Oracle Database 12c Release 2?

Which three actions are required to manually upgrade a database to Oracle Database 12c Release 2? (Choose three.)
A. Run the Pre-Upgrade information tool on the source database.
B. Take all user tablespaces offline before starting the upgrade.
C. Copy the network configuration files from the existing database home to the new Oracle home location.
D. Run the Parallel Upgrade utility from the new Oracle home.
E. Run Oracle Net Configuration Assistant (NETCA) to configure the listening protocol address and service information for the new release of Oracle Database.
F. Make all user tablespaces “read only” before starting the upgrade.
G. Start the existing database in upgrade mode.

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