A.The initial log file is named message.log.prev, and a new file named message.log is started. 
B.Once the log file is full, the oldest log entries are dropped to make space for new entries. 
C.When the log file becomes full, it is automatically copied to an external server and a new message.log file is started. 
D.Once the log file becomes full, it stops logging new messages and the new log messages are lost.