Ceres craters: rebound peaks

ceres craters central peak spire rebound impactCeres has many craters, lots of palimpsest craters but also many impact craters with central spires or rebound peaks in the middle of the crater.

How were these formed on the dwarf planet?

Are any relatively new or could these central peaks have only been formed at a precise older part of its formation?

With the largest Ceres crater that we can see at the moment, how did Ceres survive that impact? Why does it not have a rebound peak?