How many receiving addresses is a unicast transmission intended for?

Unicast transmission is designed to send data specifically to a single destination address. In networking, a unicast address uniquely identifies one receiving device on a network. This method ensures that the data packets are delivered solely to that designated recipient, preventing any other devices on the network from receiving or processing that data.

This is in contrast to other types of transmissions, such as multicast, which targets a group of devices, or broadcast, which sends data to all devices on the network. Therefore, the defining characteristic of unicast transmission is its one-to-one communication model, which aligns perfectly with the answer provided.