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單項選擇題

Note the following functionalities of various background processes: 
1:Record the checkpoint information in data file headers. CKPT 
2:Perform recovery at instance startup. SMON 
3:Cleanup unused temporary segments. SMON 
4:Free the resources used by a user process when it fails. 
5:Dynamically register database services with listeners. 
6:Monitor sessions for idle session timeout. 
Which option has the correct functionalities listed for a background process()

A.Archiver Process (ARCn):1, 2,5
B.System Monitor Process (SMON):1,4,5
C.Process Monitor Process (PMON):4,5,6
D.Database Writer Process (DBWn):1,3,4

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