Right to left shunts

A scientist is working to understand hemodynamics in congenital heart defects using biological models. She injects intravenous contrast dye into the right atrium of a model of transposition of the great vessels. What path will the contrast take to reach the pulmonary artery?

1: Right atrium→Left atrium-→Left ventricle→Right ventricle→Pulmonary artery
2: Right atrium→Right ventricle→Left ventricle→Right subclavian→Pulmonary artery
3: Right atrium→Right ventricle→Pulmonary artery
4: The contrast will not reach the pulmonary artery