What is the maximum number of ARCn processes that can be defined using the initialization parameter LOG_ARCHIVE_MAX_PROCESSES？（）

A.CKPT
B.SMON
C.LGWR
D.DBWn
E.ARCn

A.It detects corrupt blocks.
B.It performs only offline database backups.
C.It omits empty blocks during backups.
D.It performs tablespace point-in-time recovery （TSPITR）.

A.INIT.ORA
B.SQLNET.ORA
C.TNSNAMES.ORA
D.SERVICES.ORA
E.LISTENER.ORA