Which one of the following is the context in which the term "qubit" is mentioned?

1. A

   Cloud Services

   Cloud services. Use qubits only if the cloud is a quantum machine.

2. B

   Quantum Computing

   Quantum computing. A qubit is the unit of quantum information.

3. C

   Visible Light Communication Technologies

   Visible-light communication. Li-Fi; not qubits.

4. D

   Wireless Communication Technologies

   Wireless communication. Classical RF.

Summary. Official key is (b) quantum computing. A qubit (quantum bit) can be in superposition; it is the basic information unit of a quantum processor.