What is a qubit?

Question: What is a qubit in quantum computing? A) A classical bit that can only be 0 B) A database unit used to store binary records C) A quantum unit of information that can exist in a superposition of states D) A fixed hardware instruction used only for measurement Correct: C Explanation: A qubit is the basic unit of quantum information. Unlike a classical bit, which is either 0 or 1, a qubit can exist in a superposition of basis states until measurement. Topic: quantum computing / qubits / fundamentals