D20 Allowance for Doubtful Accounts has a credit balance of $800 at the end of the year (before adjustment), and analysis of accounts in the customer ledger indicates the estimated amount of uncollectible accounts should be $16,000. Based on this estimate, which of the following adjusting entries should be made? debit Allowance for Doubtful Accounts, $800, credit Bad Debt Expense, $500 debit Bad Debt Expense, $15,200, credit Allowance for Doubtful Accounts, $15,200 debit Bad Debt Expense, $800, credit Allowance for Doubtful Accounts, 5500 debit Bad Debt Expense, S16,800, credit Allowance for Doubtful Accounts, $16,800