A _____ is an electronic device that receives a weak signal and regenerates it .

repeater

The correct answer is option 3. repeater.

A repeater is an electronic device that receives a weak signal and regenerates it.

A repeater is an electronic device used in telecommunications and computer networks to receive signals, amplify them, and then retransmit them. It helps extend the range of communication by boosting the strength of signals, especially in situations where the signals have weakened over long distances. Repeaters are commonly used in wireless communication systems, fiber optic networks, and Ethernet networks to maintain signal integrity and quality over extended distances.