Don't know about gap year, but I believe many have had success with option 1. My understanding is that the academies like reaplicants who attend college and take hard core classes like calc and chem. I think it is important that you do well in class. ROTC is not required for that option, but probably doesn't hurt.
We were told by USMA RO that they favor reaplicants. It shows great commitment. I assume it is looked at the same way at USNA.