which of the following statements is false? a. none of the above b. the allowance for uncollectable acts reduces acts receivable to their net realizable value c. the percentage of receivable method may use either an overall rate or different rate for each age category d. any existing balance in allowance for uncollectable accounts is ignored in calculating the uncollectable accounts expense e. a write off of an account reduces the net amount shown for accounts receivable on the balance sheet