How much of the Sprint Backlog must be defined during the Sprint Planning event?

How much of the Sprint Backlog must be defined during the Sprint Planning event?
A . Just enough tasks for the Scrum Master to be confident in the Development Team’s understanding of the Sprint.
B . The entire Sprint Backlog must be identified and estimated by the end of the Sprint Planning meeting.
C . Enough so the Development Team can create its best forecast of what is can do, and to start the first several days of the Sprint.
D . Just enough to understand design and architectural implications.

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Answer: B