Right option is (b) Artificial Hearts
Easy explanation: Jarvik 7 was the first artificial heart to be made and approved. It had two heart pumps and a power console. The heart pumps were placed where the original heart was supposed to be. It receives air from outside which allows the pumps to contract and cause circulation of blood.
AbioCor was the second type of artificial heart to be developed. In this, the atrium is functioning well but the ventricles have been removed. AbioCor pumps the blood from one ventricle at a time so the body and lungs get blood alternatively. To make up for this, AbioCor has the capacity to pump 10 liters of blood in a minute.