The limit represents the derivative of some function f at some number a. State such an f and a.
lim (x->3) (x⁴-81)/(x-3)
a. f(x) = 4ˣ, a=81
b. f(x)=x⁴, a=4
c. f(x)=x⁵, a=27
d. f(x)=x⁴, a=81
e. f(x)=x³, a=4