You need to plan for authentication and authorization of Web application users.
Which approach should you recommend?

A.
Use the Membership API.

B.
Use the Personalization API.

C.
Use the Local Security Policy.

D.
Use the Group Policy Manager.

Explanation:
Introduction to Membership
ASP.NET membership gives you a built-in way to validate and store user credentials. ASP.NET membership therefore helps you manage user authentication in your Web sites. You can use ASP.NET membership with ASP.NET forms authentication by using with the ASP.NET login controls to create a complete system for authenticating users.
http://msdn.microsoft.com/en-us/library/yh26yfzy.aspx