For which use case would you use a rolling upgrade with the Oracle Active Data Guard feature?
A.
when upgrading from Oracle Database 12c to the first patch set of Oracle Database 12c
B.
when upgrading from Oracle Database 10g to Oracle Database 12c
C.
when upgrading from Oracle Database 11g to Oracle Database 12c
D.
when upgrading from any previous version of Oracle Database to Oracle Database 12c
Explanation:
You will be able to use this feature to perform database version upgrades starting with the first patchset of
Oracle Database 12c (that is, you cannot use it to upgrade from any version earlier than the first Oracle
Database 12c patchset). This means that the manual Transient Logical Standby upgrade procedure must still
be used when upgrading from Oracle Database 11g to Oracle Database12c, or when upgrading from the initial
Oracle Database 12c release to the first patchset of Oracle Database 12c.