单选题

You work as a database administrator for Supportcenter.cn. You enabled tracing while creating a listener to your database. What additional information is available to you when you enable tracing?()

AInformation about each Oracle Net connection.

BInformation about each entry in theLinstener.orafile

CInformation about the changed done in the database

DInformation about the different listeners in your system

EInformation about all thenondatabasefiles required to operate the database

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