What do you think are Kaiba and Zigfried's favorite programming languages and why?

We know they are both very intelligent, very skilled programmers.

Kaiba showed his programming skills ever since season 1, for example when he broke into Pegasus's dueling system to weaken the power of a fake Kaiba's BEWD in a duel against Yugi. Kaiba showed skills also in season 2 with his Duel Disk system and simulation duel.

And Zigfried showed hacking skills in season 5, when he hacked into Kaiba's amusement park and duel system.

But what do you think is Kaiba's favorite programming language? And what do you think is Zigfried's programming language? Do you think they would be the same or different?