某私网设备A 的IP 地址是192.168.1.1/24,其对应的IP 地址是2.2.2.1;设备B的IP地址是2.2.2.5。若希望B能ping通A,可以在NAT 设备上使用下列哪项配置? A. acl number 2000 rule 0 permit source 192.168.1.1 0.0.0.255 nat address-group 1 2.2.2.1 interface Ethernet 0/1 nat outbound 2000 address-group 1 B. acl number 2000 rule 0 permit source 192.168.1.1 0.0.0.255 nat address-group 1 2.2.2.1 interface Ethernet 0/1 nat outbound 2000 address-group 1 no-pat C. nat server protocol icmp global 2.2.2.1 inside 192.168.1.1 D. nat server protocol icmp global 192.168.1.1 inside 2.2.2.1