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
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