A technician must install and configure a network device in a building with 20 classrooms. Each room must be on a separate subnet and should not be able to see traffic from other subnets.
Which of the following is the MOST cost-effective solution?
A . A switch with VLANs created for each segment
B . A router with interfaces connected to a switch in each room
C . A VoIP endpoint connected to a hub for each network
D . A firewall with DHCP pools for each subnet
Answer: A