\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Consider the Voronoi diagram below for sites \(A\), \(B\), \(C\), and \(D\).
  1. How many Voronoi regions are there?
  2. Which site is closest to point \(P\)?
  3. Which site is closest to point \(Q\)?