You need to design a hosting service option for customers who want to access their databases by using their own Active Directory domain accounts. What should you do？（）

A. Design a hosting service option that duplicates each customer’s domain user account as SQL Serverlogin account.
B. Design a hosting service option that provides VPN-based connectivity from each customer’s network tothe SQL Server computer that hosts that customer’s daabase or databases.
C. Design a hosting service option that provides a dedicated server to each customer.Join that server to that customer’s Active Directory domain
Design a hosting service option that configures a unique instance of SQL Server 2005 for each customer.Configure that instance to use Integrated Windows authentication.