uppose customers in a hardware store are willing to buy N(p) boxes of nails at p dollars per box, as given by the following function. Complete arts (a) through (d). N(p)=70-4p: (2 sp5) (b) The instantaneous rate of change for a function f when xa is given by which formula? OA. lim f(a+h)-f(a) hi provided the limit exists OB. lim ho f(a-h)+f(a) 110 h provided the limit exists Oc. lim h-0 f(a-h) h provided the limit exists OD. lim f(a) h-nh provided the limit exists