What is the payback period of a project which costs $ 28,900 and have the following cash flows $12,450, $19,630 and $ 2,750 in the following three years respectively if the required rate of return is 12%? Select one: O a. 1 year, 5 months and 7 days O b. more than 3 years O c. 1 year, 10 months and 1.68 days O d. 1 year, 4 months and 7 days