Which term describes the channel that safeguards alarm signals from modification while in transit?

• A. Transmission Line
• B. Network path
• C. Control line
• D. Data link

Answer: (A)

The key idea is recognizing that protecting alarm signals as they travel relies on the physical channel that carries the message. This channel—the transmission line—is the dedicated path (cable, fiber, or wireless link) through which the alarm data move from sensors to the control or monitoring point. Its design and safeguarding (tamper resistance, shielding, proper supervision) determine whether the signal can be modified in transit.

A network path is a broader route that may involve multiple devices and networks, but it doesn’t inherently emphasize protecting the signal from alteration along the way. A control line is typically used for sending control signals to devices, not specifically for safeguarding alarm data in transit. A data link refers to the data link layer or a general linkage and doesn’t focus on the physical channel’s tamper resistance.

So, the channel that safeguards alarm signals from modification while in transit is the transmission line.