A proxy server. A system requests information from the internet, and that traffic is routed through the proxy server before arriving to the requesting system.
This is why proxy servers are used for hiding identity and being more secure, as internet traffic would show the IP address of the proxy server, and not the requesting system, though this often depends on the type of proxy server, as some proxy server's main objective isn't anonymousity, but rather efficiency.
Answer:
a. The content that displays in the browser is contained in the head section.
Computer checkup/maintenance. You forgot to mention windows updates, it is critical to perform that action as well cause of the recent ransomeware malware that is going around lately and Microsoft and other OS vendors yes even Apple have released patches to prevent it spreading even further.
