Conference presentation as an advertisement for a paper
Actually, all three of those points apply and in fact what is recommended for a conference presentation.

Additional suggestions would be the following.


In case of an original research, focus on the overview of algorithms/procedures and its nuances with respect to the existing ones (if any) or the novelty involved without jumping right down to the algorithmic details.
For a survey paper, note only the highlights of the survey and studies that provide the most impact to the field in each sub-topic. Avoid jumping to rabbit holes and missing out the opportunity to cover the big picture.
Spend a bit more time on how your findings impact your area of research. Discuss the applications and scope and detail the conclusion. I see may participants miss this one out by just elaborating on the technical aspects of their implementation without conveying what is it applied for and how could it be applied.