Final answer:
The initial Sprint duration set by a Product Owner refers to the Scrum concept of a Timebox, which is a fixed period for tasks completion within Scrum methodology. so, option b is the correct answer.
Step-by-step explanation:
When a Product Owner sets the initial Sprint duration the team has to work on their items, it refers to the Scrum concept of a Timebox. In Scrum, a Timebox is a predefined and fixed period during which a task or set of tasks must be accomplished. Sprints are iterative, fixed-length timeboxes, commonly one to four weeks long, within which the Scrum Team delivers a potentially shippable product increment. Deciding on the length of the Sprint is a crucial part of Sprint planning and sets the cadence for delivery throughout the Scrum project.
In Scrum, the initial Sprint duration that the Product Owner sets for the team to work on their items is referred to as a Timebox. A Timebox is a fixed period of time during which the team focuses on completing a set of tasks or deliverables. It helps create a sense of urgency and establishes a clear deadline for the team to work towards.