What Balance sheet valuation is used for A/R, Inventory and PPE respectively? a- A/R - NRV, Inventory - LCM, PPE - fair value b-A/R - NRV, Inventory - LCM, PPE - historical costs c-A/R - historical costs, Inventory - historical costs, PPE - historical costs d-A/R - LCM, Inventory - NRV, PPE - historical costs or fair value