When invoking a workflow, what must be done if you need to return data to the main workflow?

When invoking a workflow in UiPath and you need to return data to the main workflow, declaring an "out" argument in the invoked workflow is essential. Out arguments are specifically designed to pass data back to the caller workflow after the invoked workflow has executed. These arguments allow you to capture the results or any changes made within the invoked workflow, effectively enabling data exchange between workflows.

When the invoked workflow completes its task, it can assign values to these out arguments, which then become accessible in the main workflow that called it. This mechanism is crucial for maintaining a clear and organized flow of data, ensuring that what you need to return is properly communicated back to the parent workflow.

The other options do not facilitate data return in the same manner. Storing data only in local variables restricts the data's accessibility solely to the invoked workflow, making it unavailable to the main workflow. Using the "Invoke Code" activity does not inherently create a property for returning data in the context of standard workflows. Lastly, claiming that no special action is required overlooks the need for defined communication channels between workflows, which out arguments fulfill effectively.