Let f(x) = 15 -|x-10|, x in R. Then, th...

Let ` f(x) = 15 -|x-10|, x in R`. Then, the set of all values of x, at which the function, ` g(x) = f(f(x))` is not differentiable, is

A

{5, 10, 15}

B

{10, 15}

C

{5, 10, 15, 20}

D

{10}

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A

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