Ryan Co purchased a computer for $$15000.$ Originally it had an estimated useful life of $4$ years and a residual value of $$3000,$ but on the first day of the $4$ th year of life the estimated useful life was extended by a further two years and the residual value was reduced to zero. Ryan Co uses the straight$-$line method to depreciate its computer equipment. At the end of year $4,$ how much depreciation should be recorded for the computer?

Select one:

a$.$ $$4000$

b$.$ $$5000$

C$.$ $$3000$

d$.$ $$2000$