Which approach should you recommend?

You are designing a SharePoint 2010 application. You need to design a list that displays
only data from contacts stored in Microsoft Office Outlook 2010. Which approach should
you recommend?

A.
Export the contact list in Outlook 2010. Create a new external list based on the exported
data file.

B.
Create a list with an external data column. Set the External Content Type of this column.

C.
Create an external list. Create an external content type based on the external list and set
the Office Item Type.

D.
Create an external content type and set the Office Item Type. Create an external list from
the external content type.