Which statement is true regarding Dynamic Service Registration？（）
- ADynamic service registration requires configuration in the listener .ora file.
- BDynamic service registration can be used only with an Oracle9/instance.
- CDynamic service registration cannot register a local listener that does not use TCP/IP or port 1521.
- DThe PMON background process automatically registers each database instance if the necessary parameters have been set in the database initialization parameter file.