A controller instructs an aircraft call sign BIGJET 347 to transfer communication to another aeronautical station upon reaching a specified level. Which of the following phraseology is in accordance with agreed procedures?

Question

Answer

BIGJET 347 when reaching FL120 contact Donlon Control 119.725.

Answer

BIGJET 347 contact Donlon on 119.725 upon reaching FL120.

Answer

BIGJET 347 at FL120 call Donlon Centre on 119.725.

Answer

BIGJET 347 when flying at Level 120 contact Donlon on 119.725.

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A controller instructs an aircraft call sign BIGJET 347 to transfer communicatio...

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