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.