A company completed the following transactions during the month of October: I. Purchased office supplies on account, $4,000. II. Provided services for cash, $21,000. III. Provided services on account, $34,000. IV. Collected cash from a customer on account, $31,000. V. Paid the monthly rent of $3,600. What was the company's total revenue for the month? OA. $86,000 OB. $55,000 OC. $34,000 OD. $21,000