At the Sprint Planning, the Development Team is not able to forecast the number of Product Backlog items it can do in th

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At the Sprint Planning, the Development Team is not able to forecast the number of Product Backlog items it can do in the upcoming Sprint due to unclear requirements. The Product Owner, however, was able to clearly define the business objective he hopes to achieve in the Sprint.
Which of the following two actions would you support? (Choose two.)

A. The Development Team forecasts the most likely Product Backlog items to meet the business objective and create a Sprint Backlog based on a likely initial design and plan. Once the time- box for the Sprint Planning meeting is over, they start implementation and continue to analyze, decompose, and create additional functionality during the Sprint.
B. If all agree they can extend the Sprint Planning until the Development Team can forecast enough Product Backlog items before starting the implementation.
C. Allow the Development Team members as much time as needed to review the Product Backlog items and reconvene with the Product Owner when they are confident enough to make a forecast for the Sprint.
D. They discuss in the upcoming Sprint Retrospective why this happened and what changes will make it less likely to occur again.