Which of the Following Is Not a Kosher Standard

Which of the following is not a kosher standard?

A) Food made from pigs or rabbits can never be kosher.
B) Only people who are trained and qualified are allowed to slaughter kosher animals.
C) To be considered kosher, meat and dairy products cannot be prepared or served together on the same plate.
D) Whereas some shellfish can be kosher, fish are not.