What Is One Difference Between Captive Portal Authentication and 802

What is one difference between captive portal authentication and 802.1X authentication?

A) 802.1X authentication always authenticates the wireless client, while captive portal authentication always authenticates the wireless user.
B) 802.1X authentication is typically implemented without encryption, while captive authentication is often combined with WPA or WPA2.
C) 802.1X authentication occurs at Layer 2, while captive portal authentication occurs at Layer 3.
D) 802.1X authentication must use an LDAP server, while captive portal authentication can use a RADIUS server or an LDAP server.

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