单项选择题

OneofyourcustomerswishestousetheNAStoperformDHCPfunctionsanddoesnotcurrently haveaLayer3gatewayinitsproductionnetwork.Whichgatewaymodeisappropriateforthis customer?()

A.VirtualGateway
B.Real-IPGateway
C.NATGateway
D.IP-IPGateway