If it is senior management, my best advice would be to make absolute sure that you give them a complete picture of the bottom line impact(i.e how much money wil

If it is senior management, my best advice would be to make absolute sure that you give them a complete picture of the bottom line impact(i.e how much money will this take and how much money will it save for them). IMO if you focus on this you will almost always fall into buckets 1 and 2. Might be a bit controversial, but if the audience isn't so tech savvy then you can leave out a lot of the technical jargon because once they approve a project it won't really be their problem. Them not asking you at the end about the tech specifics(which I understood in your comment as bucket 4) might not necessarily be a bad thing.