Which four statements are true concerning the upgrading of Oracle Grid Infrastructure 12c?

Which four statements are true concerning the upgrading of Oracle Grid Infrastructure 12c?
A. The ORACLE_HOME environment variable must be set to the Grid Infrastructure home directory in the installation owner’s environment.
B. The upgrade must be done in-place.
C. The upgrade must be done out of place.
D. Upgrade validation may be done using the Oracle Universal Installer which in turn invokes the built-in cluster verification utility.
E. The cluster verification utility cluvfy.sh can verify that the cluster is ready for an upgrade.
F. The ORACLE_SID environment variable must be set to the SID of the ASM instance in the installation owner’s environment.
G. The cluster verification utility cluvfy.sh can generate fixup scripts to run on all nodes of the cluster.

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