An aging of a company's accounts receivable indicates that $$8400$ are estimated to be uncollectible. If Allowance for Doubtful Accounts has a $$4820$ credit balance, the adjustment for the period will require a

credit to Allowance for Doubtful Accounts for $$8400.$

debit to Bad Debt Expense for $$8400.$

debit to Bad Debt Expense for $$3580.$

debit to Allowance for Doubtful Accounts for $$3580.$