Which of the following is required by Scrum?
Why this is the correct answer
The Scrum framework defines several events, artifacts, and roles that are necessary to implement the framework successfully. These include the Daily Scrum, Sprint Planning, Sprint Review, Sprint Retrospective, Product Backlog, Sprint Backlog, and the Increment.
Out of the options given, only 'Sprint Retrospective' is required by Scrum. The Sprint Retrospective is an event that occurs at the end of each Sprint, where the Scrum Team reflects on their previous Sprint and identifies opportunities for improvement. The other options may be helpful for implementing Scrum effectively, but they are not required by the framework. For example, although the Scrum Guide suggests that the Daily Scrum should be time-boxed to 15 minutes and that team members should stand up during the meeting, these are not hard requirements for implementing Scrum.