To which format should the workflow be converted to modify the configuration for multiple reminder notifications?

The correct choice for converting the workflow to modify the configuration for multiple reminder notifications is XML.

XML, or Extensible Markup Language, is widely used for data representation and exchange between different systems due to its structured and hierarchical nature. It allows for easy readability by both humans and machines, enabling developers and administrators to manage configurations efficiently. When working with complex configurations, especially those that involve multiple elements like notifications, XML provides a robust and organized format that can accommodate nested structures.

This is critical for managing reminder notifications, as each notification may require specific attributes such as timing, recipients, content, and conditions that can be effectively represented using XML's nested tags.

Other formats like JSON and YML might also be suitable for configuration files, particularly in modern applications, but XML remains a preferred choice in many enterprise environments, especially for workflows and applications with established XML-based standards. Text files (Txt) do not provide the structured format needed for complex configurations, which makes them less suitable in this context.