Correct Answer - Option 2 :
\(\rm\frac{[f (b) - f(a)] }{(b - a)}\)
Explanation:
(Mean Value Theorem) Let f : [a, b] → R be a continuous function on [a, b] and differentiable on (a, b). Then there exists some c in (a, b) such that
f'(c) = \(\rm\frac{[f (b) - f(a)] }{(b - a)}\)