Medical Device Sales Corp. has many sales representatives who visit doctors offices and attempt to sell surgical equipment to doctors. When a sale is made, the sales rep needs to submit the documentation supporting the sale to the accounting department. Next, the staff accountant reviews all supporting documentation and books the sales journal entry. The system does not allow the accountant to book the journal entry without all necessary documentation. Sometimes, sales reps forget to submit the necessary supporting documentation, preventing the staff accountant from booking the entry. What management assertion is the auditor most likely concerned given this scenario? OA. Sales Completeness B. Sales - Presentation and Disclosure C. Sales - Valuation D. Sales - Occurence