Which TWO of these statements about Sprint length are true in Scrum?

Professional Scrum Master I, objective 1. Understanding and applying the Scrum framework medium

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The options

Choose 2.

Correct Sprints are fixed-length events of one month or less

Correct. Fixed length is what creates consistency, and the one-month ceiling is what guarantees inspection and adaptation of progress toward the Product Goal at least every calendar month.

Correct Shorter Sprints can be used to generate more learning cycles and to limit the risk of cost and effort to a smaller time frame

Correct. This is the usual reason to shorten a Sprint: it is a risk decision, since each Sprint may be considered a short project and a shorter one puts less at stake before the next inspection.

Not correct A Sprint may be extended by a few days when the Developers are close to finishing the selected items

Wrong. Extending the Sprint trades away the predictability the fixed length exists to create, and it does it to protect a forecast rather than a Sprint Goal. Unfinished items return to the Product Backlog and the Sprint ends on time.

Not correct Every Scrum Team in an organisation must use the same Sprint length

Wrong. Scrum sets no such rule. Teams working on one product often align their Sprints for practical reasons, but that is a sensible arrangement rather than a requirement of the framework.

Not correct The Sprint length should be chosen so that everything the Developers select can always be finished within it

Wrong, and it inverts the relationship. The Sprint is a fixed timebox that a forecast is fitted into; it is not a variable duration sized to fit a forecast.

Why

The Sprint is the only Scrum event with a fixed length rather than a maximum, and that is the whole point of it: a heartbeat you can plan against. When a Sprint's horizon is too long the Sprint Goal may go stale, complexity rises and risk grows, which is the argument for shortening. Nothing in the framework is an argument for lengthening one that has already started.

Where this comes from

Cited
Scrum Guide section The Sprint
What it says
Shorter Sprints can be employed to generate more learning cycles and limit risk of cost and effort to a smaller time frame.

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