anawer 19-21 please!

19. Given an asset, if the recovery period is 15 or 20 years, then to compute the general depreciation rate. 3 a. 200% DB switchover SL method is used b. 150% DB switchover SL method is used c. SL method is used 20. Given an asset with a recovery period of 19-y then to compute the alternative depreciation rate. 1. 200% DB switchover SL method is used b. 150% DB switchover SL method is used c. SL method is used 21. In the following figure, letters A, B, C, and D refer to, respectively, a. BV, SL, DB, and N b. BV, DB, SL, and N c. N, SI, DB, and BV d. N, BV, SL, and DB B D