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

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 occurs at Layer 2, while captive portal authentication occurs at Layer 3.
C . 802.1X authentication must use an LDAP server, while captive portal authentication can use a RADIUS server or an LDAP server.
D . 802.1X authentication is typically implemented without encryption, while captive authentication is often combined with WPA or WPA2.

Answer: B

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