Explanation:

- Network Layer (Option 1): This layer is responsible for routing, forwarding, and addressing in the network. It determines how data is sent to the correct destination.

- Transport Layer (Option 2): It ensures that data is transferred reliably and accurately. It also manages error detection and correction during data transmission.

- Session Layer (Option 3): This layer manages sessions or connections between computers. It establishes, maintains, and terminates connections.

- Data Link Layer (Option 4): Responsible for node-to-node data transfer, error checking, and framing at the mac address level.

- Correct Answer: Session Layer (Option 3) manages communication between computers.