PSM-I Exam Dumps : Professional Scrum Master I

 According to the Scrum Guide, a Development Team needs a Sprint Goal because it provides guidance and focus for building an Increment that delivers value. The other options are not valid reasons for having a Sprint Goal, as they are either incorrect (such as giving purpose only to Sprint 0 or ensuring implementation of all Product Backlog items) or irrelevant (such as knowing everything from the Product Backlog).

According to the Scrum Guide, the Product Owner can cancel a Sprint, as he or she is responsible for maximizing the value of the product and the work of the Development Team. The other roles do not have this authority, although they may provide input and suggestions to the Product Owner.