Which of the following is a key deliverable of Sprint Planning?1 pointA burndown chartThe Sprint BacklogThe project charterRetrospective notes

The key deliverable of Sprint Planning is "The Sprint Backlog".

Here's a step-by-step explanation:

1. Sprint Planning is a meeting in Scrum, a framework for Agile project management. During this meeting, the team decides what they will work on during the upcoming sprint (a set period of time, usually 2-4 weeks).

2. The output of this meeting is the Sprint Backlog, which is a list of tasks and goals the team commits to achieve by the end of the sprint.

3. A burndown chart, on the other hand, is a graphical representation of work left to do versus time. It is usually updated as the sprint progresses, not during the planning.

4. The project charter is a document that formally authorizes a project, providing a high-level overview. It's not specific to Scrum or sprint planning.

5. Retrospective notes are taken during the Sprint Retrospective, a meeting held at the end of the sprint to discuss what went well, what didn't, and how the team can improve in the next sprint.

So, out of the options provided, the Sprint Backlog is the key deliverable of Sprint Planning.