Regarding the communication model, how can the use of the same code during radio communication be ensured?

Question

Question PPL(A) - Private Pilot License - Human factor and limitations

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By the use of radio phraseology

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By using radios certified for aviation use only

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By the use of proper headsets

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By a particular frequency allocation

Id 45 - PPL(A) EN - Regarding the communication model, how can the use of the same code during radio communication be ensured?