The correct answer is B, because the time-box for a Daily Scrum is 15 minutes. The Scrum Guide states that "the Daily Scrum is a 15-minute time-boxed event for the Development Team to synchronize activities and create a plan for the next 24 hours."

According to the Scrum Guide1, Scrum promotes self-organization by giving autonomy and empowerment to the Developers who decide how to do their work within a Sprint. The Developers have no titles other than Developer, regardless of their specialization or skills. Scrum is a lightweight framework that minimizes prescription and maximizes flexibility and adaptability.

According to the Scrum Guide, the Scrum Team consists of three roles: the Scrum Master, who coaches and facilitates the team; the Product Owner, who manages and prioritizes the Product Backlog; and the Development Team, who delivers a potentially releasable Increment at the end of each Sprint. Users and customers are not roles on the Scrum Team, but they are stakeholders who may provide feedback and input to the product.

The correct answer is A, because the role of management in Scrum is to facilitate the Scrum Teams with insights and resources that help them improve. The Scrum Guide states that "the organization respects their self-organization by not telling them how they should do their work." Therefore, management should support the Scrum Teams by providing them with an environment that fosters collaboration, learning, and innovation.

The correct answer is A, because Development Team membership should change as needed, while taking into account a short term reduction in productivity. The Scrum Guide states that "development Teams are cross-functional, with all of the skills as a team necessary to create a product Increment; development Teams are self-organizing. No one (not even the Scrum Master) tells the Development Team how to turn Product Backlog into Increments of potentially releasable functionality." Therefore, changing Development Team membership may affect their cross-functionality and self-organization in the short term.