While connected to the database，a user on a PC receives a fatal error and the machine reboots. Which background process cleans up the failed connection？（）

A.NOCHECKSUM
B.MAXCORRUPT
C.CHECK LOGICAL
D.BACKUP INCREMENTAL
E.CONFIGURE DEVICE TYPE ... PARALLELISM

A.Only two destinations per remote database can be specified.
B.Destination is an Oracle Net alias specified by using the SERVICE keyword.
C.The REOPEN attribute must be used when using remote archive log file destinations.
D.The service name is resolved by searching sqlnet.ora file for the remote database name.