Consider the following cash flow pattern. In year zero: capital expense = $100,000; year 1 cash inflow = $25,000; year 2 cash inflow = $10,000; year 3 cash inflow = $50,000; year 4 cash inflow = $60,000. This cash flow pattern is described as a(n):

a, annuity and a conventional cash flow

b. mixed stream and a non-conventional cash flow

c. annuity and a non-conventional cash flow

d. mixed stream and a conventional cashflow