At the end of January, the unadjusted trial balance of Winston, Inc. included the following accounts: Unadjusted Trial Balance January 31, 2021 Debit Credit Sales (90% represent credit $1,000,000 sales) Accounts Receivable $200,000 Allowance for Doubtful $600 Accounts (1). Winston uses the balance sheet approach in estimating uncollectible accounts expense, and aging the accounts receivable indicates the estimated uncollectible portion to be $7,500. What is the amount of uncollectible accounts expense recognized in Waters' income statement for January? Select one: a $6,900 O b. $8,100 c. 5600 d. $7,500