Which of the following agreement types is used to limit external discussions?

An NDA (Non-Disclosure Agreement) is a legally binding contract that establishes a confidential relationship between parties, preventing the disclosure of specific information to unauthorized external entities. It is explicitly designed to limit external discussions and protect proprietary or sensitive information. A BPA (Business Partner Agreement) is a legal agreement between two businesses that outlines the terms and conditions of their partnership, not primarily focused on limiting external discussions. An SLA (Service Level Agreement) defines the level of service expected from a service provider, focusing on performance metrics rather than confidentiality. An MSA (Master Service Agreement) is a contract that outlines the general terms and conditions that will govern future agreements or statements of work between the parties, providing a framework but not directly limiting external discussions.