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20 - ATPL - What actually happens in the ADF receiver when the BFO position is selected?

Question 20 - Radio Navigation - ATPL - Airline Transport Pilot license

The BFO circuit is de-activated
The BFO circuit oscillates at an increased frequency in order to allow identification of A2A NDBs
The BFO circuit is activated, and the receiver accepts only A1A modulated signals
The BFO circuit imposes a tone onto the carrier wave to make the NDB's ident audible

Training tests and timed exam simulations ATPL - Airline Transport Pilot license