Which approach should you recommend?

You are designing a knowledge base (KB) solution for a SharePoint 2010 Internet site for vendors and employees
in your organization. The employees have Active Directory (AD) accounts. You have the following requirements:
You must incorporate the existing Windows authentication system based on AD.

.Vendors who have no Windows credentials must have access to the KB.
.Content editors must be able to use their Windows credentials to log on to the site and publish the content.
You need to ensure that vendors and content editors can access the site.
Which approach should you recommend?

A.
Use Windows based authentication for employees and vendors to access the KB.

B.
Use Windows based authentication for employees and forms-based authentication for vendors to access the
KB.

C.
Create a custom SharePoint group that includes employees and vendors. Give this group permission to access
the KB.

D.
Use SharePoint user profiles to allow vendors and employees to access the KB.