You are designing a data mining structure for a Microsoft SQL Server 2005 Analysis Services (SSAS) solution. The solution requires the use of relational data. You need to design the data mining structure so that the data mining models can use the data from a case table and a nested table. What should you do?

A.
Set the case table column as a key.

B.
Set the nested table column as a key.

C.
Set the case table column as a key and an input, and then set the nested table column as a key.

D.
Set the case table column as a key, and then set the nested table column as both a key and an input.