Which of the following statement is correct?
- Satellite transponders contain a device that echos the radiation without change from one point on earth to another
- Satellite transponders contain a receiver and transmitter designed to relay microwave transmissions from one point on earth to another
- Satellite transponders use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations
- Satellite transponder contains devices that transform the message sent from one location on earth to a different code for transmission to another location
(b).Satellite transponders contain a receiver and transmitter designed to relay microwave transmissions from one point on earth to another
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