Calculate the present value of a growing annuity given the following information: current cash flows: $$240,000$; cash flow growth rate $=6\%$; timeframe $=60$ years; required rate of return $=14\%.$

a$.$

$$2,661,877$

b$.$

$$2,761,877$

c$.$

$$2,861,877$

d$.$

$$3,061,877$

e$.$

$$2,961,877$