如图所示,LAN的管理VLAN是VLAN10,AP通过DHCP获取IP地址,网段为10.1.1.0/24。AP、AC和AR分别为DHCP的客户端、DHCP中继设备以及DHCP服务器。以下关于DHCP中继设备以及DHCP服务器配置正确的是()。
A.[AC]dhcpservergroupAP
[AC-dhcp-server-group-AP]dhcp-server172.21.1.2
[AC-dhcp-server-group-AP]quit
[AC]interfaceVlanif10
[AC-Vlanif10]dhcpselectrelay
[AC-Vlanif10]dhcprelayserver-selectAP
[AC-Vlanif10]quit
B.[AR]ippoolAP
[AR-ip-pool-AP]network172.21.1.0mask24
[AR-ip-pool-AP]gateway-list172.21.1.2
[AR-ip-pool-AP]excluded-ip-address172.21.1.1
[AR-ip-pool-AP]quit
[AR]interfaceGigabitEthernet0/0/1
[AR-GigabitEthernet0/0/1]dhcpselectglobal
[AR-GigabitEthernet0/0/1]quit
[AR]iproute-static10.1.1.0255.255.255.0172.21.1.1
C.[AC]dhcpservergroupAP
[AC-dhcp-server-group-AP]dhcp-server10.1.1.2
[AC-dhcpservergroup-AP]quit
[AC]interfaceVlanif10
[AC-Vlanif10]dhcpselectrelay
[AC-Vlanif10]dhcprelayserver-selectAP
[AC-Vlanif10]quit
D.[AR]ippoolAP
[AR-ip-pool-AP]network10.1.1.0mask24
[AR-ip-pool-AP]gateway-list10.1.1.2
[AR-ip-pool-AP]excluded-ip-address10.1.1.1
[AR-ip-pool-AP]quit
[AR]interfaceGigabitEthernet0/0/1
[AR-GigabitEthernet0/0/1]dhcpselectglobal
[AR-GigabitEthernet0/0/1]quit
[AR]iproute-static172.21.1.0255.255.255.010.1.1.2