Why is the aging method, used to calculate the allowance for doubtful accounts, preferable to using a single percentage for all receivables? Select all that apply. (a) It can provide a better estimate than a one-size-fits-all approach. O b) It assumes that accounts which are current are always fully collectable. c) It recognizes that older accounts are less likely to be collected. O d) It is the only method allowed by GAAP. ()e) It is easier to assign reasonable percentages to several categories than to use one percentage only for all accounts receivable