Question 4 a. The current price of RIO stock is 525 per share. If RIO's current dividend is $1 per share and investors' required rate of retum is 10 percent what is the expected growth rate of dividends for RIO, based on the constant growth dividend valuation model (2 marks) b. Define and describe non diversifiable and diversifiable risk (3 marks) C. What is the efficient market hypothesis? Discuss the three forms of the efficient market hypothesis. (2+35 marks)