You have implemented change tracking on a table named Sales.SalesOrder. 
You need to determine all columns that have changed since the minimum valid version. 
Which function should you use?
A.
CHANGE_TRACKING_CURRENT_VERSION 
B.
CHANGE_TRACKING_IS_COLUMN_IN_MASK 
C.
CHANGETABLE with the CHANGES argument 
D.
CHANGETABLE with the VERSION argument