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