Which of the following will not give the instantaneous rate of change of h(x) with respect to x when x=3?

1. lim x->3 (f(x)-f(3))/(x-3)

2. lim h->0 (f(3+h)-f(3-h))/2h

3. lim x->3 (f(3)-f(x))/(3-x)

4. (f(3)-f(3-0.1))/0.1

I know for sure the 1 will give the instantaneous rate of change. Not sure about 2,3 and 4. I guessing that 4 is the answer, because it gives what seems like an average value instead of an instantaneous value.