单选题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？（）AThe listener is not running at the server.BThe TNS_ADMIN environmental variable is set to a wrong value.CThe orcl.oracle.com database service is not registered with the listener.DThe DEFAULT_DOMAIN parameter is set to a wrong value in the SQLNET.ORA file.
单选题
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 SQLNET.ORA file.
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