Final answer:
An NDA is typically signed by customers.
Step-by-step explanation:
The correct answer is B. Customers.
An NDA, or Non-Disclosure Agreement, is a legal contract that is typically signed between two parties to protect confidential and proprietary information. In the business context, it is most commonly used when a company shares sensitive information with its customers or clients. For example, if a company is developing a new product or service and wants to share details with potential customers, it may ask those customers to sign an NDA to ensure that they will not disclose or misuse the information.
While the other options mentioned - Alpha testers, Beta testers, and Focus groups - may also be involved in testing and providing feedback on a company's product or service, the primary parties who typically sign an NDA are the customers or clients who are being given access to confidential information.