Final answer:
A Non-disclosure agreement (NDA) is the document that keeps confidential information within an organization, designed to legally protect trade secrets and proprietary information.
Step-by-step explanation:
A document designed to keep confidential information within the organization is known as a Non-disclosure agreement (NDA). An NDA is a legally binding contract that establishes a confidential relationship between parties to protect any type of confidential and proprietary information or trade secrets. It ensures that the information being provided will not be made available to any others without prior consent. In contrast, the other options listed, such as the scope of work or statement of work (SoW), and the request for proposal (RFP), serve different purposes. A SoW outlines the work that will be performed for a project or a specific job, while an RFP is a document that solicits proposals from potential vendors or service providers.