You need to complete the mapping of the Team Type column

You are using the Knowledge Discovery feature of the Data Quality Services (DQS) client
application to modify an existing knowledge base.
In the mapping configuration, two of the three columns are mapped to existing domains in
the knowledge base. The third column, named Team Type, does not yet have a domain.
You need to complete the mapping of the Team Type column.
What should you do?

A.
Add a column mapping for the Team Type column.

B.
Map a composite domain to the source column.

C.
Create a composite domain that includes the Team Type column.

D.
Add a domain for the Team Type column.

Explanation:
http://msdn.microsoft.com/en-us/library/ff877917.aspx
http://msdn.microsoft.com/en-us/library/hh213015.aspx
http://msdn.microsoft.com/en-us/library/gg524799.aspx