In Quantum Computing, the basic unit of information that can exist in multiple states simultaneously is called:

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1. **Definition:** A qubit is the basic unit of quantum information.

2. **Superposition:** A qubit can be in a mix of states: $|\psi\rangle = \alpha|0\rangle + \beta|1\rangle$.

3. **Compare:** A classical bit is only 0 or 1. A qubit can be both at once until measured.

4. **Conclusion:** The description matches **qubit**, choice (b).

FINAL_ANSWER: b

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