Lamar Dmas, the assistant vice-chancellor of communications at ABA University, was allowed to make purchases of under $3,500 for her department without external approval. Unfortunately, she also sometimes bought items for herself, such as expensive antiques and other collectibles. How did she do it? She replaced the vendor invoices he received with fake vendor invoices that she created. The fake invoices had descriptions that were more consistent with the communications department's purchases. She submitted these fake invoices to the accounting department as the basis for their journal entries and to the accounts payable department as the basis for payment. Identify the missing control