A government agency requires the setup of an ultra-secure communication system for handling top-secret information. Which of the following represents the most appropriate approach to achieve the maximum level of security through physical isolation?
Using dedicated cabling to connect systems while still being part of the internet.
Setting up the system on a completely air-gapped network.
Creating multiple VLANs to segregate top-secret communication from other data traffic.
Installing a high-end firewall with strict access control lists.