Your network contains a SharePoint server 2007 server farm ,The farm contains web application named http://portal , You are creating a Bussiness Data Catalog (BDC) that connects to a web service , permissions to access the web service are only assigned to the application pool identity of http://portal , you need to identofy which authentication method must be used in the application definition file (ADF).

Which Authentication method should you identify ?

A.
PassThrough.

B.
RevertToSelf.

C.
WindowsCredentials.

D.
RdbCredentials.