Bad Qubits — Learn Quantum by Doing

Multiple choice

The SWAP gate can be built from exactly three CNOTs with alternating control and target. Which sequence of CNOTs (each written control->target) realizes SWAP on qubits 0 and 1?

cx(0,1), cx(1,0)
cx(0,1), cx(0,1), cx(0,1)
cx(0,1), cx(1,0), cx(0,1)
cx(1,0), cx(1,0), cx(1,0)