You need to create a custom Web Part that meets the following requirements:

* Includes all of the functionalities of the Search Results Web Part
* Includes additional filters based on the current user department

What should you do?

A.
Create a Web Part that inherits the CoreResultsWebPart class.

B.
Create a Web Part that inherits the SearchResultsBaseDatasource class.

C.
Modify the SearchDisco.aspx page and modify the descriptor file for the Search Summary Web Part.

D.
Modify the SearchDisco.aspx page and modify the descriptor file for the Search Core Results Web Part.

Explanation:
MNEMONIC RULE: “Search Results Web Part = CoreResultsWebPart”

Specifies the user interface (UI) control that displays the results for a search query in the SharePoint Enterprise Search UI

CoreResultsWebPart Class
http://msdn.microsoft.com/en-us/library/microsoft.office.server.search.webcontrols.coreresultswebpart.aspx