What is the definition of heart failure?

Heart failure is a clinical syndrome in which the heart has a reduced capacity to fill with blood or eject it.
Heart failure is a condition in which the heart has an increased capacity to fill with blood or eject it.
Heart failure is a disease that affects the lungs and causes difficulty breathing.
a) Only statement I is correct.
b) Only statement II is correct.
c) Statement I and II are correct.
d) Statement II and III are correct.