Which of the following statement is correct

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Which of the following statement is correct?

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

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

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

D. satellite transponders us 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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