A technician is configuring a computer lab at a school. The computers need to be able to communicate with each other, but students using the computers should not be able to access the internet. Which of the following rules on the firewall should the technician configure for the lab computers?
A. Block all LAN to LAN traffic
B. Block all LAN to WAN traffic
C. Block all WAN to LAN traffic
D. Block all WLAN to WAN traffic