Explanation:

- The Network layer (Option 1) is responsible for the delivery of individual packets from the source host to the destination host. It determines the best path for data transmission and handles logical addressing, routing, and packet forwarding.

- Correct Answer: Network

- The Physical layer (Option 2) deals with the transmission of raw bit streams over a physical medium, such as cables or radio frequencies.

- The Data Link layer (Option 3) ensures reliable transmission of data across a single network link by handling error detection and correction.

- The Application layer (Option 4) provides network services directly to end-users and applications.