How is a Bell state commonly created?

Question: Which sequence can create the Bell state (|00⟩ + |11⟩)/√2 from |00⟩? A) Apply X to both qubits B) Apply H to the first qubit, then CNOT with the first qubit as control C) Measure both qubits immediately D) Apply Z to the second qubit only Correct: B Explanation: Applying H to the first qubit creates superposition. Then CNOT uses that qubit as the control and correlates the second qubit with it, producing an entangled Bell state. Topic: quantum computing / Bell states / entanglement