What type of data is primarily stored in Microsoft SQL Server for Milestone products?

The choice indicating that all of the provided data types—user credentials, system configuration, and video footage—are primarily stored in Microsoft SQL Server for Milestone products reflects the comprehensive capabilities of the database in managing various types of critical information.

Microsoft SQL Server serves as a relational database management system, making it suitable for storing structured data associated with Milestone products. User credentials are essential for authentication and access control, ensuring secure operations within Milestone's software environments. System configuration data includes settings and preferences that define how Milestone products operate, aligning with the unique requirements of each installation.

Moreover, while video footage may be managed and analyzed using Milestone's technologies, metadata about this footage, such as timestamps, user interactions, and system performance logs, can be stored within SQL Server. This integration facilitates efficient data retrieval and enhances the overall performance of the Milestone solutions.

Thus, the correct answer encapsulates the multifaceted use of SQL Server in managing various essential data types for Milestone products, highlighting its role in supporting both security and operational efficiency.