You are discussing with your colleagues about WPA authentication and one of them has asked about the captive portal. Which of the following will you answer?
1) The captive portal is a web page that is displayed to users before they can access the internet.
2) The captive portal is a security protocol used for WPA authentication.
3) The captive portal is a type of encryption used in WPA authentication.
4) The captive portal is a device that controls access to a network.