Difference between -a -b -c builds?

[dj69]

I see some reference to windivert sign but still don't follow. Why are there -a, -b, and -c builds? The company I work for has strict rules for downloading, so I'd like to just know which one to use.

[celeron533]

https://github.com/jagt/clumsy/commit/d7c5fcfe22543925a62e05a994e63a2204862070

build against windivert A/B/C signs

https://reqrypt.org/windivert.html

[celeron533]

And the -a -b -c is targeting to solve issue #84