An administrator connects VoIP phones to the same switch as the network PCs and printers. Which of the following would provide the BEST logical separation of these three device types while still allowing traffic between them via ACL?
A. Create three VLANs on the switch connected to a router
B. Define three subnets, configure each device to use their own dedicated IP address range, and then connect the network to a router
C. Install a firewall and connect it to the switch
D. Install a firewall and connect it to a dedicated switch for each device type