You create a Microsoft Office SharePoint Server 2007 portal site. The site contains a document retention policy for request for proposal (RFP) documents. You need to customize the policy to ensure that a notification is sent to each project manager when the RFP date expires. What should you do?

A.
Implement a custom IPolicyFeature.OnCustomDataChange method that generates an e-mail message.

B.
Implement a custom IPolicyFeature.ProcessListItemOnRemove method that generates an e-mail message.

C.
Create a document retention workflow that monitors the expiration date of RFP documents and generates an e-mail message.

D.
Extend the built-in policy feature definition to use a custom policy resource expiration action that generates an e-mail message.