According to the Scrum Guide 1 , the definition of "Done" is a formal description of the state of the Increment when it meets the quality measures required for the product. The definition guides the Development Team in creating a "Done" Increment. The definition of "Done" is created by the development organization (or Development Team if none is available from the development organization). The definition of "Done" may vary significantly per Scrum Team, depending on the context. One aspect of Scrum Teams inspecting how they work toward their Product Goal is that they improve their definition of "Done" over time.
Therefore, one reason why the Product Owner wants the Development Team to adhere to its definition of
"Done" is to have complete transparency into what has been done at the end of each Sprint.
References: Scrum Guide

According to the Scrum Guide, when multiple Scrum Teams are working on the same product, they should integrate their Increments every Sprint, in order to accurately inspect what is done and ensure that there is no technical debt or unfinished work at the end of each Sprint. The other options are not valid, as they imply that integration can be skipped, delayed, or done only for some teams, which is not consistent with Scrum values and principles.

The correct answer is A, because if two Scrum Teams are added to the development of a product that previously had only one Scrum Team, the immediate impact on the productivity of the original Scrum Team is likely to decrease. This is because adding more teams may introduce some challenges and trade-offs, such as increased communication and coordination overhead, reduced alignment and cohesion, and potential conflicts or dependencies.
References: [Suggested Reading for Professional Scrum Master I]

According to the Scrum Guide 1 , the definition of "Done" is a formal description of the state of the Increment when it meets the quality measures required for the product. The definition guides the Development Team in creating a "Done" Increment. The definition of "Done" is created by the development organization (or Development Team if none is available from the development organization). The definition of "Done" may vary significantly per Scrum Team, depending on the context. One aspect of Scrum Teams inspecting how they work toward their Product Goal is that they improve their definition of "Done" over time.
Therefore, one good way for a Scrum Team to ensure security concerns are satisfied is to add security concerns to the definition of "Done". Another good way is to have the Scrum Team create Product Backlog items for each concern, as they are responsible for managing and refining the Product Backlog.
References: Scrum Guide

The correct answers are B and E, because Scrum has no "tester" role and everyone in the Development Team is responsible for quality. The Scrum Guide states that "the Development Team consists of professionals who do the work of delivering a potentially releasable Increment of 'Done' product at the end of each Sprint.
Development Teams are structured and empowered by the organization to organize and manage their own work. The resulting synergy optimizes the Development Team's overall efficiency and effectiveness."