A company purchased a new computer system for $28,000. One year later, the resale value of the system was $15,700. Assume that the value of the computer system declines according to an exponential model. At what rate was the value of the computer system changing 4 years after it was purchased?

A. Declining at the rate of $2,767.74 per year.

B. Declining at the rate of $1,601.26 per year.

C. Declining at the rate of $3,6214.88 per year.

D. Declining at the rate of $8,803.21 per year.

E. Declining at the rate of $2,546.52 per year.

F. None of the above.