A company would like to offer free wireless Internet to visiting customers without compromising security on their
internal network.
Which of the following firewall rules should a technician configure to accomplish this?

A.
Block all LAN to LAN traffic

B.
Block all LAN to WLAN traffic

C.
Block all WAN to LAN traffic

D.
Block all WLAN to LAN traffic

Explanation:
http://searchsecurity.techtarget.com/WLAN-security-Best-practices-for-wireless-network-security