The Correct Placement of a Butter Knife on a Bread

The correct placement of a butter knife on a bread and butter plate is

A) the knife positioned in a horizontal manner, with the blade facing down, at the top of the plate.
B) the knife positioned in a horizontal manner, with the blade facing down, in the middle of the plate.
C) the knife positioned in a vertical manner, toward the right-hand side of the plate, with the blade facing toward the left.
D) all of the above answers are correct
E) none of the above answers is correct