Find the Discounted Payback Period (DPP) for Oman Water Company if the initial investment is 6000 OMR and the cash Inflows are as follows: Year 1 =2500 OMR; Year 2 = 3000 OMR; Year 3=2500 OMR and Year 4=3000 OMR. Use discount rate as 8% Select one: a. 3.16 years O b: 2.16 years c. None