Your network consists of a single Active Directory domain. The functional level of the domain is Windows Server 2008 R2. All servers run Windows Server 2008 R2.  
A corporate security policy requires complex passwords for user accounts that have administrator  privileges.
You need to design a strategy that meets the following requirements：
èEnsures that administrators use complex passwords  
èMinimizes the number of servers required to support the solution
What should you include in your design？（）

Your network consists of a single Active Directory domain. The functional level of the domain is Windows Server 2008 R2. All domain controllers run Windows Server 2008 R2.  
A corporate policy requires that the users from the research department have higher levels of account and password security than other users in the domain.  
You need to recommend a solution that meets the requirements of the corporate policy.
Your solution must minimize hardware and software costs.
What should you recommend？（）