oracle ocp 19c考题7，科目082考试题-listener tnsnames

In the spfile of a single instance database, LOCAL_LISTENER is set to LISTENER_1.The TNSNAMES.ORA file in $ORACLE_HOME/network/admin in the database home contains:LISTENER_1=(ADDRESS=(PROTOCOL=TCP)(HOST=host1.abc.com)(PORT=1521))Which statement is true?A. Dynamic service registration cannot be used for this database instanceB. The LREG process registers services dynamically with the LISTENER_1 listenerC. LISTENER_1 must also be defined in the LISTENER.ORA file to enable dynamic service registrationD. There are two listeners named LISTENER and LISTENER_1 running simultaneously using port 1521 on the same host as the database instancesE. The definition for LISTENER_1 requires a CONNECT_DATA section to enable dynamic service Registrationsource:cuug