Choose three. Which three are true about patchsets?
A.正确答案BDEThey are installed via OPatch or OPatchAuto.
B.A base release is not needed to install patchsets.
C.They can be applied in a rolling fashion for Clusterware and the databases.
D.Installing a patchset is considered an "upgrade."
E.They can introduce new features.
F.They are only released quarterly.
