Which of the following actions must be taken before committing changes?

The correct action that must be taken before committing changes to a scenario is ensuring that the scenario is updated to reflect any changes from its parent. In the context of scenario management, a parent scenario serves as the foundational blueprint from which child scenarios derive their data and settings. When changes are made to the parent scenario, it is crucial for the child scenarios to incorporate those updates to maintain data integrity and consistency throughout the project.

By updating the child scenario with the latest information from its parent, it ensures that the child scenario is operating on the most current data and reflects the latest operational decisions being made. This process is essential before any commitment of changes, as it mitigates the risk of discrepancies and aligns the operational insights across different scenarios.

In contrast, making a scenario available to all users, publishing the parent scenario, or setting the scenario to read-only may pertain to other aspects of scenario management but do not directly address the necessary action regarding the updates from the parent scenario. Therefore, updating the child scenario is foundational for a successful and coherent commitment of changes.