Which transmission method is NOT listed as a current option for alarm signaling systems?

• A. Telephone networks
• B. Radio networks
• C. Internet
• D. Satellite networks

Answer: (D)

Transmission methods for alarm signaling systems commonly include telephone networks, radio networks, and the Internet. Satellite networks are not typically listed as a current standard option because they involve higher costs, larger equipment, and greater latency, which can affect speed and reliability of signaling. While satellite may be used in very remote locations or as a backup, it is not considered a primary current option in most mainstream configurations.