Which statements are true regarding listeners（）A、Listeners use only the TCP/IP protocol.B、Multiple listener processes can run simultaneously on a host.C、Multiple database instances can be registered with a single listener.D、The listener-related errors ca
题目
Which statements are true regarding listeners（）
- A、Listeners use only the TCP/IP protocol.
- B、Multiple listener processes can run simultaneously on a host.
- C、Multiple database instances can be registered with a single listener.
- D、The listener-related errors can be traced only at the administrative level.
- E、Only one database instance can be registered with a single listener at any time