Final answer:
option a,A router is the most suitable device to connect a LAN to the internet. It acts as the gateway and provides features like security and traffic prioritization.
Step-by-step explanation:
A router is the most suitable device to connect a LAN to the internet. A router acts as the gateway between the LAN and the internet, directing network traffic between them. Routers can connect multiple devices to the internet and provide network security features like firewall protection. They can also prioritize network traffic for specific applications and devices.
In comparison, a hub is a simple device that broadcasts data to all connected devices without any intelligence or management. A switch is more advanced than a hub, as it can separate and direct data to the correct device based on their MAC addresses, but it does not have the capability to connect a LAN to the internet.
A cable is a physical medium used to connect devices, but by itself, it cannot connect a LAN to the internet, as it requires an intermediary device like a router or a switch with routing functionality.