A company is setting up a wireless network, and the network administrator wants to enforce the strongest
security possible. Which wireless security should the administrator use?

A.
802.1X with WPA2

B.
WPA2 with preshared key

C.
WPA with preshared key

D.
MAC-auth

Explanation:
WPA2 is the final version of Wi-Fi Protected Access. It’s the most secure option available and the one you
should be using.
http://www.makeuseof.com/tag/wpa2-wep-and-friends-whats-the-best-way-to-encrypt-your-wi-fi/