Which of the following datatypes are used in situations where you want an ordered set of data elements, where every element is the same datatype, and where you predefine the number of elements that appear in the set?（）

A.Online 
B.Pending online 
C.Offline 
D.Stale

A.Size of typical transactions 
B.Concurrent transactions 
C.Size of rows in table most frequently changed 
D.Number of anticipated disk sorts

A.V$SESSION 
B.V$SYSSTAT 
C.DBA_SEGMENTS 
D.V$SORT_USAGE