You are reviewing the design of a student dimensiontable in an existing data warehouse hosted on SQL Azure.
The current dimension design does not allow the retention of historical changes to student attributes such as
ParentOccupation. You need to redesign the dimension to enable the full historical reporting of changes to
multiple student attributes including ParentOccupation. What should you do?

A.
Add CurrentValue and PreviousValue columns to thestudent dimension.

B.
Enable Snapshot Isolation on the data warehouse.

C.
Add an IsCurrent column to the student dimension.

D.
Add StartDate and EndDate columns to the student dimension.