Which activity would you use to ensure a proper cleanup regardless of any errors?

The activity that effectively ensures proper cleanup regardless of any errors is the Try Catch activity. This activity is designed to handle exceptions that may arise during the execution of a workflow. By using Try Catch, you can define a block of code to try (the "Try" section), and if an error occurs, control is passed to the "Catch" section where specific error handling can be implemented.

This structure allows you to include cleanup actions in the "Finally" section, which will execute whether an exception was thrown or not, ensuring that resources are released and states are properly reset. This is particularly useful in scenarios such as closing files, releasing database connections, or performing any other necessary cleanup operations that should happen regardless of the outcome of the preceding Try block.

In contrast, activities like Do While and While are primarily control flow structures that allow for repeated execution of code based on a condition but do not inherently manage exceptions. Invoke Workflow simply allows for the execution of another workflow but does not provide error handling capabilities on its own. Therefore, the Try Catch activity is the optimal choice for ensuring cleanup in the presence of errors, making it the correct answer in this scenario.