Which statement is true regarding Dynamic Service Registration？（）

• A、Dynamic service registration requires configuration in the listener .ora file.
• B、Dynamic service registration can be used only with an Oracle9/instance.
• C、Dynamic service registration cannot register a local listener that does not use TCP/IP or port 1521.
• D、The PMON background process automatically registers each database instance if the necessary parameters have been set in the database initialization parameter file.