Find for y = 1x +8 by using the definition and then rationalizing the numerator. For what values of x is the function differentiable? Explain. . . . = dx (Type an exact answer, using radicals as needed.) For what values of x is the function differentiable? O A. The function is differentiable for all real numbers x> - 8 since the derivative and the function are both defined for those values. O B. The function is differentiable for all real numbers x S - 8 since the function is defined for those values. O C. The function is differentiable for all real numbers x 2 - 8 since the function is defined for those values. O D. The function is differentiable for all real numbers x