Please help with practice.

The equation of the tangent line to the graph of y = f(x) at both x = 3 and x = 4 is y = x + 5. Which of the following must be true? 0 M3) = N4) = 1 O The function f (x) is the line y = x + 5. 0 f8) = f(4) 0 None of the above. 0 The function f (x) is not differentiable at x = 3 and at x = 4