Which of the following statement(s) is (are) true about the human heart? (A) Right atrium receives oxygenated blood from lungs through pulmonary artery. (B) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body. (C) Right atrium receives deoxygenated blood through vena cava from upper and lower body. (D) Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body. (a) (A) (b) (A) and (D) (c) (B) and (C) (d) (B) and (D)