Nubela Manufacturing is considering two alternative investment proposals with the following data: Investment Useful life Estimated annual net cash inflows for 5 years Residual value Depreciation method Required rate of return Proposal Y $560,000 5 years $102,000 $28,000 Straight line Straight-line 11% ProposalX $10,200,000 5 years $2,040,000 $56,000 13% Calculate the payback period for Proposal X OA. 8 years OB. 5 years O C. 4 years D. 10 years