Seriously, you need to do your own research and address the true constraints I have already pointed out to you. In doing that you will find out the background information you clearly don’t understand. You are actually going to have to work a little to understand the industry. Knowledge isn’t going to just fall into your lap.

Look up McCakill Bond and how SLIs work under it. That’s at least a start. Eventually you will be able to answer your own questions.