The correct answer is A: A network of repeaters in which signals received by one repeater are transmitted by all the repeaters in the network. A linked repeater network is a system where multiple repeaters are connected together, so that when one repeater receives a signal, all the other repeaters in the network simultaneously retransmit that signal. This creates a wide-area coverage system where a transmission on one repeater is heard across the entire network. Linked networks are commonly used for emergency communications, public service events, and regional coordination. The linking can be done via radio links, internet connections, or other methods. This allows operators to communicate over a much larger area than a single repeater could cover.