Which message type outlines duties, functions, and parameters for link operations?

The message type that outlines duties, functions, and parameters for link operations is OPTASKLINK. This message is specifically designed to provide detailed instructions and information necessary for managing and executing link operations, which are crucial for effective communication and operational coordination in military contexts. It includes parameters such as the tasks assigned, operational details, and guidelines that personnel must follow to ensure successful link operations.

Understanding the content and purpose of OPTASKLINK is essential for personnel who are involved in joint and combined military operations, as it facilitates the integration of various systems and enables efficient command and control processes. This specificity and operational focus are what distinguish OPTASKLINK as the correct answer in the context of link operations.