If f(x) = {{:(|x-1|([x]-x)",",x ne 1),(0...

If `f(x) = {{:(|x-1|([x]-x)",",x ne 1),(0",",x = 1):}`, then

A. `f'(1^(+)) = 0`

B. `f'(1^(-)) = 0`

C. `f'(1^(-)) = - 1`

D. f(x) is differentiable at x = 1

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