Which WLAN security protocol implements Perfect Forward Secrecy?

WPA3 is the correct answer because it incorporates Simultaneous Authentication of Equals (SAE) as its key exchange mechanism, which provides Perfect Forward Secrecy (PFS). PFS ensures that if a long-term key is compromised, past session keys remain secure and cannot be decrypted. WEP is an outdated and insecure protocol with known vulnerabilities, offering no PFS. WPA (WPA1) was an interim solution that improved upon WEP but also lacks PFS. WPA2, while a significant improvement over WPA and widely used, primarily uses the 4-way handshake for key exchange, which does not inherently provide PFS. While some implementations might add PFS, it's not a native, mandatory feature of the core WPA2 standard like it is with WPA3's SAE.