Confusion conerning the preparation phase and reward phas

I know that currently before each stacking reward cycle, there is a preparation cycle but i don’t get some things about this idea of 2 phases that I hope to be resolved by getting the following questions answered with the help of you guys.

Questions:

  1. How long is the reward cycle phase and what is the name for the period that includes both the reward cycle phase and preparation phase?
  2. Is the preparation phase of the next cycle included in the current cycle like at cycle 2 of the blockchain will the preparation phase be from 4100-4200 or 4200-4300
  3. if the answer for the above is 4200-4300 then who will mine those blocks if the stackers are preparing and did not enter yet
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