单项选择题 Your network contains an Active Directory domain named contoso.com. The domain contains a DHCP server named Server1that runs Windows Server 2012 R2. You create a DHCP scope named Scope1. The scope has a start address of 192168.1.10, an end address of 192.168.1.50, and a subnet mask of 255.255.255.192. You need to ensure that Scope1 has a subnet mask of 255.255.255.0. What should you do first?（）

单项选择题 You have a server named Server1 that runs Windows Server 2012 R2. You plan to create an image of Server1. You need to remove the source files for all server roles that are not installed on Server1. Which tool should you use?（）

单项选择题 Your network contains an Active Directory domain named contoso.com. All servers run Windows Server 2012 R2. An application named Appl.exe is installed on all client computers. Multiple versions of Appl.exe are installed on different client computers. Appl.exe is digitally signed. You need to ensure that only the latest version of Appl.exe can run on the client computers. What should you create?（）