Which two are true about rolling release upgrades in a Data Guard environment? (Choose two.)
A. The background process DMON must be enabled on the primary and standby databases during a rolling release upgrade procedure.
B. A physical standby database can be converted to a logical standby database temporarily.
C. Rolling release upgrades require the background process RVWR to write flashback logs on the standby database.
D. The KEEP IDENTITY clause ensures that a logical standby database keeps the same DBID as the primary database.
E. The recovery point objective increases proportionally to the duration of the rolling release upgrade procedure.
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