单项选择题

A. The service IP addresses must be on a separate subnet and VLAN.
B. The non-service and service IP addresses must be on the same subnet and on the same VLAN.
C. All interfaces on a node must be in different subnets. All subnets must be on the same VLAN. 
D. One non-service and one service IP address must be on the same logical subnet. All interfaces must be on the same VLAN.