Which of the following wireless security features provides the best wireless security mechanism?

WPA with 802.1X (WPA-Enterprise) leverages IEEE 802.1X port-based network access control with an EAP method and a RADIUS server, enabling mutual authentication on a per-user basis and deriving unique per-session encryption keys, which prevents credential sharing and makes key compromise far more difficult than any PSK-based scheme.

WPA-PSK relies on a single pre-shared key known by all users, making the entire network vulnerable if that key is compromised or brute-forced.

WEP uses the RC4 cipher with a flawed short static IV implementation that allows an attacker to recover the key in minutes using passive traffic capture.

WPA alone without 802.1X defaults to PSK mode in practice, which lacks per-user authentication and dynamic key derivation provided by the enterprise 802.1X model.