5. þ D. A, B, and C are all incorrect.
ý A, B, and C. A is wrong because a copy of the controlfile can be created
while the database is open, via a read-consistent snapshot. B is wrong because
this command will generate a CREATE CONTROLFILE script, not a file copy.
C is wrong because the file multiplexing is an additional precaution, not the
only one.
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