Which of the following best describes the concept of the aging method of receivables?

a. Accounts receivable should be directly written off when the due date arrives and the customers have not paid the bill.

b. An accurate estimate of bad debt expense may be arrived at by multiplying historical bad debt rates by the amount of credit sales made during a period.

c. Estimating the appropriate balance for the allowance for doubtful accounts results in the appropriate value for net accounts receivable on the statement of financial position.

d. The precise amount of bad debt expense may be arrived at by multiplying historical bad debt rates by the amount of credit sales made during a period.