What is cross-functionality in a Scrum Team?

Correct answer: Developers have all the skills necessary to create a valuable Increment

Option C is correct because the Scrum Guide defines cross-functionality as the Developers collectively possessing all the skills needed to create a Done Increment each Sprint, without requiring external help, meaning the team as a whole is self-sufficient even if individual members have different specializations. Option A is incorrect because cross-functionality refers to the team's collective skill coverage, not a rotation of roles; the Scrum Guide defines three accountabilities, Product Owner, Scrum Master, and Developers, as fixed within a Sprint. Option B is incorrect because responsibility for communication and collaboration belongs to the entire Scrum Team, not solely to the Scrum Master, whose role is to coach and remove impediments rather than be the sole communicator. Option D is incorrect because cross-functionality encourages breadth and T-shaped skills across the team rather than narrow specialization in a single area, which would create bottlenecks and dependencies.