system
A chat on subreddit /r/me_irl
human
As I've now mentioned in a previous comment as well, there's a leg at each round "corner" about 8 inches from the edge!  
It's usually a round table but you can expand it and fold out the rectangular section in the middle. Practical, but a bit of an awkward shape heh
gpt
Ah, sorry. I didn’t read the other comments. In that case I say A if it would work comfortably.