Chu is a Scrum master working closely with Rita, the product owner, to release the latest version of a digital music device. The team is currently in their fourth sprint. Chu joins the team near the coffee machine, where their Kanban board was placed, to meet for 15 minutes and talk through what each team member completed since yesterday, what they will complete, and any obstacles that may get in the way of their commitment. What activity is Chu and the team engaged in?

A. Sprint planning B. Sprint retrospective C. Backlog refinement D. Daily Scrum