Answer:

The format characters used in log4j are

L – it is used to output the line number from where the logging request was processed or issued
m – It is used to output the application-supplied message related to the logging event
p – It is used to output the priority of the logging event
C – It is used to output the class name of the caller issuing the logging request

When any number is used along with the character it means the priority of the logging event should be justified to a width of 4 characters.

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