Samuelson Electronics has a required payback period of 4 years for all of its projects. Currently, the firm is analyzing two independent projects. Project A has an expected payback period of 3.1 years and a net present value of $42,000. Project B has an expected payback period of 4.1 years with a net present value of $2,640. Which project(s) should be accepted based on the payback decision rule? O A. Project B only B. Project A only C. Neither A nor B D. Both A and B