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Which of the following statement is correct?

A. Satellite transponders contain a receiver and transmitter designed to relay microwave transmissions from one point on earth to another.

B. Satellite transponders contain a device that echos the radiation without change from one point on earth to another.

C. Satellite transponder contains devices that transform the message sent from one location on earth to a different code for transmission to another location.

D. Satellite transponders use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations

E. None of the above

Answer: Option A

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