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Which code fragment will produce a maximally entangled, or Bell, state?

Which code fragment will produce a maximally entangled, or Bell, state?
A . bell = QuantumCircuit(2)
bell.h(0)
bell.x(1)
bell.cx(0, 1)

B . bell = QuantumCircuit(2)
bell.cx(0, 1)
bell.h(0)
bell.x(1)
C . bell = QuantumCircuit(2)
bell.h(0)
bell.x(1)
bell.cz(0, 1)
D . bell = QuantumCircuit(2)
bell.h(0)
bell.h(0)

Answer: A

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