An aging of a company's accounts receivable indicates that $$8500$ are estimated to be uncollectible. If Allowance for Doubtful Accounts has a $$4000$ credit balance, the adjustment to record bad debts for the period will require a

debit to Allowance for Doubtful Accounts for $$4500.$

debit to Bad Debt Expense for $$4500.$

debit to Bad Debt Expense for $$8500.$

credit to Allowance for Doubtful Accounts for $$8500.$