If(x) is a differentiable function, which of the following statements about f'(0) must always be true? (Choose all that apply.)
O f'(0) is the average rate of change of f(x) over the interval [0, 1].
O f'(0) is the y-value of f(x) at x = 0.
O f'(0) is the slope of the secant line of y = f(x) over the interval [0,1]
O f'(0) is the instantaneous rate of change of f(x) at x = 0.
O f'(0) is the slope of the tangent line of y = f(x) at at x = 0.