The appropriate action for a Scrum Master at the Daily Scrum is teaching the Development Team to keep the Daily Scrum time-boxed to 15 minutes or less. The Scrum Master is responsible for ensuring that all Scrum events occur and are positive and productive. The Daily Scrum is a meeting for the Development Team and not led directly by the Scrum Master. It is crucial for the event to be time-boxed efficiently, and it is the Scrum Master’s role to guide and educate the team in adhering to Scrum practices, including time-boxing.