What is the maximum database block size supported for the Oracle9i database？（）

A.Recover Manager （RMAN） utility
B.Import utility
C.Export utility
D.O/S backup command

A.MAX_DISPATCHERS
B.DISPATCHERS
C.MIN_DISPATCHERS
D.SHARED_SERVERS

A.Listener.ora
B.Tnsnames.ora
C.Cman.ora
D.Sqlnet.ora