Where is the mitral valve located, and what is its primary function?

Between the left ventricle and aorta; prevents backflow of blood into the left ventricle

Between the right atrium and right ventricle; prevents backflow of blood into the right atrium

Between the right ventricle and pulmonary artery; prevents backflow of blood into the right ventricle

Between the left atrium and left ventricle; prevents backflow of blood into the left atrium