Which of the following is INCORRECT statement about cause of aging?
a) Aging occurs due to programmed changes in hormonal or neural factors.
b) Aging happens based on the idea of built-in, or "programmed" obsolescence: nothing works perfectly or lasts forever.
c) Aging occurs due to changes in physical activity and diet.
d) Aging occurs due to the switching off of certain genes.
e) Aging occurs due to hormonal changes in our body.