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Besides f(a) = f(b) and continuity on [a, b], Rolle's theorem needs
Af'(a) equal to zero
Bf positive on [a, b]
Cdifferentiability on (a, b)
Ddifferentiability at a and b
Answer & Solution
Correct answer: C. differentiability on (a, b)
The theorem assumes the function is differentiable inside the open interval, with no demand at the endpoints.
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