Final answer:
The 'Ready to Promote' checkbox indicates that the User Story is ready for deployment, but does not trigger immediate promotion.
Step-by-step explanation:
The correct answer to the question of what the Ready to Promote checkbox indicates is that it signifies the User Story is ready for deployment. When this box is checked, it means that all necessary steps have been completed to ensure that the User Story can safely be deployed to the next environment, such as testing or production. However, this does not mean that it triggers the immediate promotion of the User Story; it simply acts as an indicator for team members to understand that the User Story has met all the criteria to proceed to the next stage in the development process.