Identify the correct statement about the cardiovascular system anatomy: The superior mediastinum is subdivided into three portions: anterior, middl...

Identify the correct statement about the cardiovascular system anatomy:
The superior mediastinum is subdivided into three portions: anterior, middle, and posterior.
The heart structures include the apex, base, pericardium, right atrium, right ventricle, left atrium, left ventricle, coronary sinus, tricuspid valve, mitral valve, semilunar valves, interventricular septum, papillary muscles, fossa ovalis, pectinate muscles, chordae tendineae, transverse sinus of the pericardium, oblique sinus of the pericardium, coronary sulcus, and posterior interventricular sulcus.
The vascularization of the cardiovascular system includes the superior vena cava, ascending aorta, aortic arch, descending aorta, brachiocephalic trunk, left common carotid artery, left subclavian artery, left pulmonary artery, right pulmonary artery, left and right superior pulmonary veins, left and right inferior pulmonary veins, right brachiocephalic vein, left internal jugular vein, left brachiocephalic vein, left subclavian vein, right subclavian artery, right coronary artery, anterior interventricular branch of the left coronary artery, posterior interventricular branch of the right coronary artery, circumflex branch of the left coronary artery, and middle cardiac vein.
The respiratory muscles include the intercostal muscles, transversus thoracis muscle, serratus anterior muscle, diaphragm, semispinalis muscle, splenius muscle, levator scapulae muscle, rhomboid major muscle, serratus posterior superior muscle, rhomboid minor muscle, latissimus dorsi muscle, trapezius muscle, transversospinal muscle, and infraspinatus muscle.

a) Statement 1 is correct.
b) Statement 2 is correct.
c) Statement 3 is correct.
d) Statement 4 is correct.