Which of the following statements is correct?

D
Explanation: A) Vertical angulation is described in degrees, with the vertical angulation of the tube head and PID beginning at zero, where they are parallel to the floor. The vertical angulations, scaled in 5 or 10 degrees, are inscribed on the sides of the yoke, where the tube head is connected. When pointing down toward the floor, the vertical angulation is called positive, and when pointing up toward the ceiling, the vertical angulation is called negative.
B) Vertical angulation is described in degrees, with the vertical angulation of the tube head and PID beginning at zero, where they are parallel to the floor. The vertical angulations, scaled in 5 or 10 degrees, are inscribed on the sides of the yoke, where the tube head is connected. When pointing down toward the floor, the vertical angulation is called positive, and when pointing up toward the ceiling, the vertical angulation is called negative.
C) Vertical angulation is described in degrees, with the vertical angulation of the tube head and PID beginning at zero, where they are parallel to the floor. The vertical angulations, scaled in 5 or 10 degrees, are inscribed on the sides of the yoke, where the tube head is connected. When pointing down toward the floor, the vertical angulation is called positive, and when pointing up toward the ceiling, the vertical angulation is called negative.
D) Vertical angulation is described in degrees, with the vertical angulation of the tube head and PID beginning at zero, where they are parallel to the floor. The vertical angulations, scaled in 5 or 10 degrees, are inscribed on the sides of the yoke, where the tube head is connected. When pointing down toward the floor, the vertical angulation is called positive, and when pointing up toward the ceiling, the vertical angulation is called negative.

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