单项选择题 Your network contains an Active Directory domain named adatum.com. The domain contains a member server named L0N-DC1. L0N-DC1 runs Windows Server 2012 R2 and has the DHCP Server server role installed. The network contains 100 client computers and 50 IP phones. The computers and the phones are from the same vendor. You create an IPv4 scope that contains addresses from 172.16.0.1 to 172.16.1.254. You need to ensure that the IP phones receive IP addresses in the range of 172.16.1.100 to 172.16.1.200. The solution must minimize administrative effort. What should you create?（）

单项选择题 Your network contains an Active Directory forest named contoso.com. The forest contains a single domain. The domain contains two domain controllers named DC1 and DC2 that run Windows Server 2012 R2. The domain contains a user named User1 and a global security group named Group1. You need to ensure that User1 can manage the group membership of Group1. The solution must minimize the number of permissions assigned to User1. Which cmdlet should you run?（）

多项选择题 Your network contains an Active Directory domain named contoso.com. You have a DHCP server named Server1 that runs Windows Server 2008. You install Windows Server 2012 R2 on a server named Server2. You install the DHCP Server server role on Server2. You need to migrate the DHCP services from Server1 to Server2. The solution must meet the following requirements: Ensure that existing leases are migrated. Prevent lease conflicts. Which three actions should you perform?（）