The tnsnames.ora file has an ent

单项选择题The tnsnames.ora file has an entry for the service alias ORCL as follows:The TNS ping command executes successfully when tested with ORCL; however, from the same OS usersession, you are not able to connect to the database instance with the following command:SQL > CONNECT scott/tiger@orcl What could be the reason for this?（）: A、The listener is not running on the database node.; B、The TNS_ADMIN environment variable is set to the wrong value.; C、The orcl.oracle.com database service is not registered with the listener.; D、The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.; E、The listener is running on a different port.

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