Which of the following triggers can be used to initiate a rollout?

The option that states "On Publication" is the correct trigger for initiating a rollout because it signifies the moment when new content or changes to a project are formally made available for users or stakeholders. In various business and project management contexts, a rollout refers to the implementation phase where modifications or new features are actively disseminated and utilized.

When a publication occurs, it typically means that the content has passed all necessary reviews and is ready to be shared with a wider audience. This moment serves as a key point in the process where stakeholders expect to see changes applied or new features rolled out systematically.

Other triggers, such as modification, deactivation, or update, might indicate various stages of managing a project but do not specifically represent the moment of officially making changes available for public or operational use. Therefore, while those events are important in the lifecycle of a project, they do not serve as the decisive point for executing a rollout like publication does.