Question

How are a telegraph, a radio satellite, and a wireless computer network related?
A.
They are all outdated devices that were used to send digital signals using X-ray technology.
B.
They are devices from different time periods that all transport matter across short distances.
C.
They are a historical sequence of devices that encode and transmit information using wave technology.
D.
They are all modern devices that use visible light to send messages across long distances.

Answer 1

C.

They form a historical progression for encoding and transmitting information: the telegraph used electrical signals (early electromagnetic signaling), radio satellites use radio-frequency electromagnetic waves, and wireless computer networks use radio/microwave wireless signals.