A is correct because a cloud mindset means embracing the cloud capabilities and avoiding unnecessary customizations that could impact the performance, scalability, and maintainability of the solution. Therefore, using supported extensibility technologies is important to ensure compatibility and compliance with the cloud environment.
D is correct because a cloud mindset also means ensuring transparency on deviations from the standard SAP functionality and documenting the rationale and impact of any customizations or extensions that are required to meet the customer needs. Verified :

C is correct because Definition of Done is the information that the project team needs before they can correctly estimate the relative size of backlog user stories. Definition of Done is a set of criteria that determines when a user story is considered complete and ready for acceptance by the product owner. It helps the team to align their expectations and assumptions on each user story, and provide consistent and reliable estimates.