Calculate the NPV of a machine that is purchased for $5,000, sold at the end of year 4 for $2,500, and produces the following cash flows: - Year 1: $700 - Year 2: $800 - Year 3: $900 - Year 4: $1,000. Assuming that the appropriate discount rate is 6%, what is the NPV?

A.) -$99.64.

B.) $99.64.

C.) -$2,079.87.

D.) $2,079.87.