B is false, "Patch sets are a mechanism for delivering fully tested and integrated product fixes. Patch sets provide bug fixes only; they do not include new functionality and they do not require certification on the target system."
BDF because this question refers to old release (prior to 12.1.0.2) when patchset was a real upgrade installed with OUI. In Oracle 19c patch model change a lot.
BDF
A. They can be applied in a rolling fashion for Clusterware and the databases.
False - Can be applied rolling for clusterware only, because that's the only one we have multiple environments. Not for databases.
B. They can introduce new features.
Correct
C. They are installed via OPatch or OPatchAuto.
False - We can install via the OUI, the Oracle Universal Installer
D. Installing a patchset is considered an upgrade.
Correct - We can install via the OUI, the Oracle Universal Installer, considered an upgrade for that.
E. They are only released quarterly.
False - Its about PSU . They are released quarterly. Apply it on top of any given patch set. So they are cumulative patches.
F. A base release is not needed to install patchsets.
Correct - Full releases start with 11g R2. Don't carry a base release
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