All of the following are key differences between GAAP and IFRS with respect to accounting for inventories except the:
a. definition of the lower-of-cost-or-market test for inventory valuation differs between GAAP and IFRS.
b. average-cost method is prohibited under IFRS.
c. inventory basis determination for write-downs differs between GAAP and IFRS.
d. guidelines are more principles-based under IFRS than they are under GAAP.