You are the network administrator for your company. The network consists of a single Active Directory domain. All domain controllers run Windows Server 2003. All client computers run Windows XP Professional.   The company has legacy applications that run on UNIX servers. The legacy applications use the LDAP protocol to query Active Directory for employee information.  The domain controllers are currently configured with the default security settings. You need to configure enhanced security for the domain controllers. In particular， you want to configure stronger password settings， audit settings， and lockout settings. You want to minimize interference with the proper functioning of the legacy applications.   You decide to use the predefined security templates. You need to choose the appropriate predefined security template to apply to the domain controllers.  What should you do？（）

• A、 Apply the Setup security.inf template to the domain controllers.
• B、 Apply the DC security.inf template to the domain controllers.
• C、 Apply the Securedc.inf template to the domain controllers.
• D、 Apply the Rootsec.inf template to the domain controllers.