Allowance for Doubtful Accounts has a credit balance of $600 at the end of the year (before adjustment), and bad debt expense is estimated at 1% of credit sales. If credit sales are $813,400, the amount of the adjusting entry to record the estimated uncollectible accounts receivable is:

a). $8,734 

b). $8,134 

c). $7,534 

d). Cannot be determined.