What distinguishes a heart attack from heart failure.A.A heart attack results from poor blood flow, while heart failure involves a total interruption of blood flow.B.Both heart attack and heart failure result in heart tissue death, but more tissue dies as a result of heart failure.C.Heart tissue dies during a heart attack, while heart failure results in systemic oxygen deficiency.D.Heart failure results in body tissues receiving such a high level of oxygen that it is toxic.