You are designing a SharePoint 2010 application that contains a Web Part. The Web Part must connect to an RSS data stream provided by a Web service. The Web service is on another server in the domain. You need to recommend an authentication approach that meets the following requirements:
. SharePoint users must not be required to supply additional credentials for the Web service.
. Standard authentication systems available to SharePoint 2010 must be used.
Which authentication approach should you recommend?
A. NTLM
B. Forms-based authentication (FBA)
C. Kerberos
D. Lightweight Directory Access Protocol (LDAP)
