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？

【多选题】
A [AC]dhcp server group AP [AC-dhcp-server-group-AP]dhcp-server 172.21.1.2 [AC-dhcp-server-group-AP]quit [AC]interface Vlanif 10 [AC-Vlanif10]dhcp select relay [AC-Vlanif10]dhcp relay server-select AP [AC-Vlanif10]quit
B [AR]ip pool AP [AR-ip-pool-AP]network 172.21.1.0 mask 24 [AR-ip-pool-AP]gateway-list 172.21.1.2 [AR-ip-pool-AP]excluded-ip-address 172.21.1.1 [AR-ip-pool-AP]quit [AR]interface GigabitEthernet 0/0/1 [AR-GigabitEthernet0/0/1]dhcp select global [AR-GigabitEthernet0/0/1]quit [AR]ip route-static 10.1.1.0 255.255.255.0 172.21.1.1
C [AC]dhcp server group AP [AC-dhcp-server-group-AP]dhcp-server 10.1.1.2 [AC-dhcp server group-AP]quit [AC]interface Vlanif 10 [AC-Vlanif10]dhcp select relay [AC-Vlanif10]dhcp relay server-select AP [AC-Vlanif10]quit
D [AR]ip pool AP [AR-ip-pool-AP]network 10.1.1.0 mask 24 [AR-ip-pool-AP]gateway-list 10.1.1.2 [AR-ip-pool-AP]excluded-ip-address 10.1.1.1 [AR-ip-pool-AP]quit [AR]interface GigabitEthernet 0/0/1 [AR-GigabitEthernet0/0/1]dhcp select global [AR-GigabitEthernet0/0/1]quit [AR]ip route-static 172.21.1.0 255.255.255.0 10.1.1.2

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