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正确答案ABC
