Your tnsnames.ora file has the following entry for the service alias ORCL: ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = 10.156.24.216) (PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl.oracle.com) ) ) The TNSPING command executes successfully when tested with ORCL but 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 at the server.
B. The TNS_ADMIN environmental variable is set to a wrong value.
C. The orcl.oracle.com database service is not registered with the listener.
D. The DEFAULT_DOMAIN parameter is set to a wrong value in the SQLNEORA file.