Which one of the following statements concerning bad debt expenses is correct? 1 Select one: O a a. When you write off an accounts receivable, you debit bad debt expense and credit accounts receivable. O b. When the allowance method is used, bad debt expense is recorded before the accounts are written off. Oc Under the percentage of receivables method, bad debt expense is the year-end receivables multiplied by the % of uncollectible accounts. O d. You record bad debt expense when individual accounts receivable becomes uncollectible