Question

6. A function y = f(x) is said to be differentiable at point x = a if ……..

A. it possesses a differential coefficient and differentiable at a point x = a

B. it does not possesses a differential coefficient but differentiable at a point x = a.
C. it possesses a differential coefficient and not differentiable at a point x = a.

D. it possesses a differential coefficient and differentiable at any point x