Which solution allows guests at a corporate headquarters to access the Internet while requiring acceptance of an acceptable use policy?

A captive portal is a web page that users must view and interact with before being granted broader access to the Internet. This page often includes an acceptable use policy that must be acknowledged by the user. By utilizing a captive portal, the corporate headquarters can effectively ensure that guests agree to the organization's rules and policies regarding Internet use before accessing the network.

The use of open PSK (Pre-Shared Key) on access points does not provide a mechanism for policy acceptance, as it simply allows access without any conditions or acknowledgment from the guest, making it less secure and controlled. A Web Application Firewall (WAF) is designed primarily to protect web applications by filtering and monitoring HTTP traffic, which does not facilitate the guest access process or policy acceptance. A Wireless Intrusion Prevention System (WIPS) focuses on monitoring and protecting wireless networks from intrusions and does not serve to authenticate or inform guests of usage policies. Thus, a captive portal is the most suitable solution for the requirement presented.