Imagine that you are an experienced strategist working in a media planning agency. You receive a client brief that contains only vague information on the "Who" and the "What". In the context of media planning, why is it important for you to push back and verify the "Who"? Support your answer with an example. In addition, what is meant by the "What"? Can you think of two examples of best-practice questions that would always need addressing in relation to the "What" part of the process?