What could be the reason for this（） <img src="/Image1/4c/4c57f375c5cfc173b32030c33b4c17dd.jpg" /><br>A:The listener is not running on the database node.<br>B:The TNS_ADMIN environmental variable is set to a wrong value.<br>C:The orcl.oracle.com database service is not registered with the listener.<br>D:The DEFAULT_DOMAIN parameter is set to a wrong value in the sqlnet.ora file.

What could be the reason for this（）

A:The listener is not running on the database node.
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.

出自：Oracle认证

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