Final answer:
The time-boxed events in Scrum are Sprint Planning, Daily Standup, and Sprint Review. Sprint Planning involves planning the work for the Sprint, Daily Standup synchronizes the team's daily work, and Sprint Review focuses on inspecting the Increment and adapting the Product Backlog. Product Backlog Refinement, however, is a continuous process not confined to a time box.
Step-by-step explanation:
The three time-boxed events in Scrum are a) Sprint Planning, b) Daily Standup (also known as Daily Scrum), and c) Sprint Review.
Sprint Planning is a time-boxed event that marks the start of the Sprint. During this event, the Scrum Team plans the work to be performed during the Sprint.
The Daily Standup is a brief, time-boxed event that occurs every day of the Sprint where the team synchronizes activities and creates a plan for the next 24 hours.
Sprint Review is held at the end of the Sprint to inspect the Increment and adapt the Product Backlog if needed.
However, d) Product Backlog Refinement is not considered a time-boxed event in Scrum; it is an ongoing process that can occur at any time during a Sprint, as it involves the continuous updating of the Product Backlog to ensure that it's ready for future Sprints.