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What is the frequency in which the DME transmits?

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What is the frequency in which the DME transmits?

(a) 50Mhz above or below the received frequency

(b) 20Mhz above the received frequency

(c) 40Mhz below the received frequency

(d) 63Mhz above or below the received frequency

The question was posed to me in exam.

The question is from Point Source Radio Systems topic in portion Terrestrial Radio Navigation System of Avionics

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Correct option is (d) 63Mhz above or below the received frequency

To elaborate: The Ground beacon in the DME receives the airborne pulses, and after a 50μs delay, retransmits them back to the aircraft on a frequency 63Mhz above or below the airborne transmitting frequency. Here the frequency received by the DME is the Airborne transmitting frequency.

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