The direction of blood flow through the heart is best described by which of these?

Aorta- right atrium right ventricle lungs pulmonary vein→ left atrium → left ventricle → vena cava

Vena cava- right atrium - right ventricle - lungs - pulmonary artery - left atrium - left ventricle

Right atrium → right ventricle → pulmonary vein→ lungs → pulmonary artery → left atrium → left ventricle

Right atrium → right ventricle → pulmonary artery → lungs pulmonary vein→ left atrium → left ventricle