1. Which three are true about patchsets（）?
   A、They are only released quarterly
   B、They are installed via Opatch or Opatchauto.
   C、A base release is not needed to install patchsets.
   D、They can introduce new features
   E、They can be applied in a rolling fashion for Clusterware and the databases
   F、Installing a patchset is considered an upgrade.

答案:CDF

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