I'm pretty sure they went with option "B", then refined with option "A" if things turned out differently than expected. Many times, the testing to find out if "A" was what they wanted was not attempted. They did "B", ran the tests and if everything was OK, moved on. That's the only thing that seems reasonable for the J2BD.
Last edited by Walter Atkinson; 11th Jun 2016 at 21:58.