The correct answer is: A. Frequency hopping TDD scheme
Bluetooth is a short-range wireless technology that allows two or more devices to communicate with each other. It is used in a variety of applications, including mobile phones, headsets, and speakers.
Bluetooth uses a frequency hopping spread spectrum (FHSS) technique to avoid interference from other wireless devices. FHSS involves rapidly changing the frequency of the signal, which makes it difficult for other devices to pick up the signal.
Bluetooth also uses time division duplex (TDD) to allow two devices to communicate with each other. TDD involves dividing the available bandwidth into two time slots, one for each device. This allows each device to transmit and receive data without having to wait for the other device to finish transmitting.
The other options are incorrect because they do not describe the way that Bluetooth works.
- Option B, Frequency hopping FDD scheme, is incorrect because it does not use TDD.
- Option C, DSSS TDD scheme, is incorrect because it does not use FHSS.
- Option D, DSSS FDD scheme, is incorrect because it does not use either FHSS or TDD.