Which of the following will give the most accurate calculation of aircraft ground speed?

Question

Question ATPL - Airline Transport Pilot license - Radio Navigation

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A DME station sited on the flight route

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A DME station sited across the flight route

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A VOR station sited on the flight route

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Yellow to amber to blue

Id 192 - ATPL - Which of the following will give the most accurate calculation of aircraft ground speed?