Which of the following wireless security techniques is the MOST secure?

WEP (Wired Equivalent Privacy) uses weak RC4 encryption with static keys and has well-documented vulnerabilities that allow it to be cracked within minutes - it is considered completely insecure.

Disabling SSID broadcast is security through obscurity; the network is still visible to any wireless scanner and provides no encryption or authentication benefit.

WPA uses TKIP (and WPA2 uses AES-CCMP) to provide robust encryption and authentication for wireless communications, replacing the fundamentally broken RC4-based WEP protocol. Unlike WEP, WPA includes per-packet key mixing and message integrity checks, making it resistant to the replay and key-recovery attacks that defeat WEP. Among all listed options, enabling WPA (especially WPA2 or WPA3) provides the strongest cryptographic protection for the wireless network.

MAC filtering can be bypassed easily by spoofing a legitimate MAC address using freely available tools, making it an ineffective stand-alone security control.