Please write out correct answer and whether it's A, B, C or D. Thank you.

A capital investment under consideration requires an initial investment of $520,000 Net cash flows from the investment are estimated to be: Year Net Cash Flow 1 $120,000 2 110,000 3 110,000 4. 100,000 5 80,000 6 80,000 7 60,000 8 60,000 What is the cash payback period? O 6 years O 4 years O 5 years O 3 years