Kunkle Company wishes to earn 8% annually on its investments. If Kunkle makes an investment that equals or exceeds that rate, it considers it a success. Assume that Kunkle invests $4.2 million and gets $700,000 in return at the end of each year for X years. What is the minimum value of X (number of years) for which Kunkle will consider the investment a success? Assume that Kunkle can't invest for fractional parts of a year. (FV of $1, PV of $1, FVA of $1, PVA of $1, FVAD of $1 and PVAD of $1) (Use appropriate factor(s) from the tables provided.)

a. 4 years.

b. 7 years.

c. 9 years.

d. 6 years.