In which regions of the human genome would you expect to find the most genetic diversity and why? In

In which regions of the human genome would you expect to find the most genetic diversity and why?
In non-coding regions, because there is less selective pressure to maintain non-coding nucleotide sequence.
In non-coding regions, because there is selective pressure to alter non-coding sequence.
In coding regions, because there is selective pressure to preserve amino acid sequence in proteins.
In coding regions, because there is selective pressure to alter amino acid sequence in proteins.
There is no meaningful difference between coding and non-coding regions in terms of genetic diversity.