第 63 题 (单选题)： In the spfile of a single instance database, LOCAL_LISTENER is set to LISTENER_. The TNSNAME.ORA file in $ORACLE HOME/network/admin in the database home contains: LISTENER_1 = (ADDRESS= (PROTOCOL= TCP) (HOST =host.ab.com) (PORT=1521)) Which statement is true.

A. There are two listeners named LISTENER and LISTENER_1 running simultaneously using port 1521on the same host as the database instances. B. The definition for LISTENER_1 requires a CONNECT_DATA section to enable dynamic service registration. C. LISTENER_1 must also be defined in the LISTENER. ORA file to enable dynamic service registration. D. The LREG process registers services dynamically with the LISTENER_1 listener . E. Dynamic service registration cannot be used for this database instance 显示答案