Which of the following statement is correct?

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Which of the following statement is correct?

Options:

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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