The radar controller is transmitting: `Confirm squawk`. What does he mean?

Question

Domanda PPL(A) - Licenza Pilota Privato (Aerei) - Comunicazioni in inglese

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The controller wants to know which code is set on the transponder.

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The controller wants you to repeat your last transmission once again.

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The controller wants you to transmit your bearing

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The controller requests the registration of the aircraft.

Id 89 - ppl(A) - The radar controller is transmitting: `Confirm squawk`. What does he mean?