A company filed a complaint with its IT service provider after the company discovered the service provider's external audit team had access to some of the company's confidential information. Which of the following is the most likely reason the company filed the complaint?

The correct answer is that a required NDA (Non-Disclosure Agreement) had not been signed. An NDA is a legally binding contract that establishes a confidential relationship between two or more parties, ensuring that sensitive information shared during a business engagement remains protected and is not disclosed to unauthorized individuals or entities. In this scenario, the service provider's external audit team, which likely consists of third parties, gained access to confidential company information without a signed NDA, leading to a complaint. An MOU (Memorandum of Understanding) outlines general intentions but is often not legally binding regarding confidentiality. A SOW (Statement of Work) defines project-specific activities and deliverables but doesn't primarily focus on confidentiality agreements for third parties. A WO (Work Order) authorizes specific tasks but also doesn't inherently cover confidentiality for external auditors. Therefore, the absence of a signed NDA is the most direct and likely reason for the complaint regarding unauthorized access to confidential information.