A, B, AND C ARE ALL INCORRECT

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.