Repeat c-section

Ma

I had an emergency c-section with my first and my dr already told me I won’t be eligible for a VBAC, so I’m curious how they cut you again. Will they cut my old scar out and leave a new incision, or will they cut over my old scar, just making it bigger? I’m okay with my current scar (I guess), but I really don’t want it to get any bigger or any higher!