A coffee shop owner wants to restrict internet access to only paying customers by prompting them for a receipt number. Which of the following is the best method to use given this requirement?

A captive portal is the best method because it redirects new users to a special web page (the portal) before granting them full network access. This portal can be configured to require a receipt number or other credentials, directly fulfilling the owner's requirement. WPA3 is a Wi-Fi security standard that encrypts traffic but doesn't provide a mechanism for receipt-based access control. PSK (Pre-Shared Key) is a simpler authentication method where all users share the same password, which doesn't allow for individual receipt validation. IEEE 802.1X is an authentication standard often used for enterprise networks, providing strong authentication with a RADIUS server, but it's more complex than needed for this scenario and doesn't inherently support a simple receipt number prompt without significant customization.