Which of the following statements is/are always true? I. If a function fis continuous at a number a, then f is differentiable at a. II. If a function fis differentiable at a, then fis continuous at a. A II only B Neither I nor II I only D Both I and IIQuestion 24 Which of the statements is/are true about the derivative of a function f and the slope of the tangent line m at a? A m=f'(a) B m =f' (x) C m =f (a) D m =f (x)Question 20 The tangent line to the curve y= x + / atx=0 is A vertical B inclined to the right with positive slope horizontal D inclined to the left with negative slope