Determine if the function f left parenthesis x right parenthesis equals fifth root of x to the power of 4 end root is differentiable at x equals 0. If not, identify why. a.) f left parenthesis x right parenthesis equals fifth root of x to the power of 4 end root is differentiable at x equals 0. b.) f left parenthesis x right parenthesis equals fifth root of x to the power of 4 end root is not differentiable at x equals 0 because f apostrophe left parenthesis 0 right parenthesis is not defined. c.) f left parenthesis x right parenthesis equals fifth root of x to the power of 4 end root is not differentiable at x equals 0 because limit as x rightwards arrow 0 of fifth root of x to the power of 4 end root does not exist. d.) f left parenthesis x right parenthesis equals fifth root of x to the power of 4 end root is not differentiable at x equals 0 because f left parenthesis 0 right parenthesis is not defined