Which statements are true regarding listeners（） A: AListeners use only the TCP/IP protocol. B: BMultiple listener processes can run simultaneously on a host. C: CMultiple database instances can be registered with a single listener. D: DThe listener-related errors can be traced only at the administrative level. E: EOnly one database instance can be registered with a single listener at any time
Which statements are true regarding listeners（） A: AListeners use only the TCP/IP protocol. B: BMultiple listener processes can run simultaneously on a host. C: CMultiple database instances can be registered with a single listener. D: DThe listener-related errors can be traced only at the administrative level. E: EOnly one database instance can be registered with a single listener at any time
Which two statements are true regarding listeners（） A: AListeners use only the TCP/IP protocol. B: BMultiple listener processes can run simultaneously on a host. C: CMultiple database instances can be registered with a single listener. D: DThe listener-related errors can be traced only at the administrative level. E: EOnly one database instance can be registered with a single listener at any time.
Which two statements are true regarding listeners（） A: AListeners use only the TCP/IP protocol. B: BMultiple listener processes can run simultaneously on a host. C: CMultiple database instances can be registered with a single listener. D: DThe listener-related errors can be traced only at the administrative level. E: EOnly one database instance can be registered with a single listener at any time.