Assume that a company considers undertaking a project which has a life of 10 years. If the cash flows of the project are on the average spread evenly over the life of the project and the company has a cost of capital of 10.1%, the optimal cutoff period is closest to: Select one: a. 6.1 years b. 3.9 years O c. 5.1 years O d. 4.2 years