Answer:
The correct answer would be, To rehearse it with a knowledgeable person.
Step-by-step explanation:
When a person instructs a person or a group of person, or gives information about a certain topic, task, project, plan, idea, or anything, he is basically briefing the audience. Before giving briefing to the audience, the person needs to make a comprehensive briefing document which he will present to the audience. So when he has done constructing the briefing, the final step should be to discuss it or rehearse it with a knowledgeable person, who can cross question you about the content to fully make you prepared for the upcoming briefing session.