13. þ D. The only time a listener is required is if the DBCA is used, and Database
Control is selected. The DBCA will not continue if it cannot detect a listener.
ý A, B, and C. A is wrong because there is a circumstance where a listener
is required; B is wrong because in all other circumstances a listener is not
required. C is wrong because it does not go far enough: The DBCA will not
require a listener, if Database Control is not selected.
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