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Which statement is true about Oracle Net Listener?（）
A:It acts as the listening endpoint for the Oracle database instance for all local and non-local user connections.
B:A single listener can service only one database instance and multiple remote client connections.
C:Service registration with the listener is performed by the process monitor (PMON) process of each database instance.
D:The listener.ora configuration file must be configured with one or more listening protocol addresses to allow remote users to connect to a database instance.

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出自：Oracle认证

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