Which three are activities performed by SMON?

A.
cleaning up the database buffer cache and freeing resources that a client process was using

B.
applying online redo during instance recovery

C.
cleaning up temporary segments that are no longer needed

D.
performing database services registration with the default listener

E.
restarting a server or a dispatcher process that terminated abnormally

F.
recovering failed transactions that were skipped during instance recovery because of file-read or tablespace
offline errors