单项选择题 You work as an administrator at Contoso.com. The Contoso.com network consists of a single domain named Contoso.com. All servers on the Contoso.com network have Windows Server 2008 R2 installed. Most of the Contoso.com servers have 64 – bit CPU’s installed, while the rest have 32 – bit CPU’s installed. You are informed that Contoso.com wants to deploy Windows Server 2012 R2 on all their servers. You need to make recommendations to ensure that this is possible. Which of the following would you recommend?（）

单项选择题 You work as an administrator at Contoso.com. The Contoso.com network consists of a single domain named Contoso.com. All servers in the Contoso.com domain, including domain controllers, have Windows Server 2012 R2 installed. You have been instructed to add a new domain controller to Contoso.com’s existing environment. Which of the following actions should you take?（）

多项选择题 You are attempting to delete a global security group in the Active Directory Users and Computers console, and the console will not let you complete the task. Which of the following could possibly be causes for the failure?（）