So what would the cats choose in the wild?
Canned (and cooked) tuna, mussels, shrimps, reindeer, rabbit, beef etc of course. /s
Given that pretty much everyone just buys canned pet food or kibble at the store, and most of those are made out of whatever is left over after slaughtering animals for human consumption, the whole point of “forcing your cat to eat against its natural habits” is somewhat moot.
B and D are weight classes. B 125 is tested to 125 kN, D 400 is tested to 400 kN.
DIN 4271 tells you how manholes of class B are to be build.