Carolina Truck Lines purchased a truck at a cost of $22,000 in 2014. As of January 1, 2019, depreciation of $18,000 had been recorded on this asset. Depreciation expense for 2019 is $2,000. Before the adjustments are recorded and posted at December 31, 2019, what is the truck's book value? a $4,000 Ob. $22,000 c. $18,000 d. $2,000