Question

Which is the definition of telegraphy?
A. the science of creating sound waves using pulses in a symbolic code
B. the transmission of signals using light waves from things such as lighthouses
C. the science of using or making communication systems to transmit or reproduce information
D. the transmission of radio waves that get converted back into sound waves at the receiver

Answer 1

C. the science of using or making communication systems to transmit or reproduce information