A consulting firm is setting up a guest Wi-Fi network. They want to provide internet access to guests while ensuring that the guest network is completely isolated from the internal corporate network. They also want to limit the number of concurrent guest connections and prevent any single guest from consuming excessive bandwidth. Which combination of technologies would BEST achieve these goals? a) VLANs, NAT, and QoS b) Firewalls, Intrusion Detection Systems (IDS), and VPNs c) DNS, DHCP, and Web Application Firewalls (WAFs) d) Routers, Switches, and Load Balancers