You are designing an extranet site using SharePoint 2010. This site must allow employees to log on to the
extranet site from home. They should use their corporate Active Directory credentials by typing their user name
and password into text boxes on a logon page on the site. After users log on, they should be redirected to the site
home page. You need to meet these requirements with the least amount of configuration.
Which type of authentication should you design?

A.
Forms-based authentication (FBA)

B.
Web Single-Sign On (SSO)

C.
NTLM

D.
Kerberos