为自己加油

Which three are true about upgrading Oracle Grid Infrastructure?

(Choose three.)

A.
A direct upgrade can be performed only from the immediately preceding
Oracle Grid Infrastructure version.
B.
The newer version is installed in a separate Oracle Grid Infrastructure home on
The same server as the existing version.
C.
An existing Oracle base can be used.
D.
The upgrade process will automatically install all mandatory patches for the
Current version of Oracle Grid Infrastructure.
E.Existing Oracle Database instances must be shut down before starting the
Upgrade.
F.Only the grid user can perform the upgrade.