Which Layer 2 WLAN mode on a Cisco WLC allows passphrase entry and provides forward secrecy?

WPA3 Personal is the correct answer because it is the only option listed that offers both passphrase entry and forward secrecy. WPA3 Personal uses Simultaneous Authentication of Equals (SAE) as its key exchange mechanism, which provides stronger protection against offline dictionary attacks and ensures forward secrecy. Forward secrecy means that if the long-term key (the passphrase) is compromised in the future, past session keys remain secure. WPA2 Personal also uses a passphrase but relies on a Pre-Shared Key (PSK) mechanism, which does not inherently provide forward secrecy. WPA2 Enterprise and WPA3 Enterprise use 802.1X authentication with an external RADIUS server, not a simple passphrase, and while they can offer forward secrecy depending on the EAP method used, they don't fit the "passphrase entry" criterion in the same way as Personal modes.