Which of the following is a legitimate reason the valuation of common stock is generally harder than the valuation of bonds? I. Future cash flows on stocks are not known in advance. II. Common stocks don't have a maturity date. III. Common stock valuation is sensitive to estimates of the dividend growth rate. Which of the following is a legitimate reason the valuation of common stock is generally harder than the valuation of bonds? I. Future cash flows on stocks are not known in advance. II. Common stocks don't have a maturity date. III. Common stock valuation is sensitive to estimates of the dividend growth rate. I, II, and III II and III only I only I and III only I and II only