If vertical angulation of the tube head is set at zero, the PID will be

A) parallel to the floor.
B) perpendicular to the floor.
C) in positive angulation.
D) in negative angulation.

A
Explanation: A) The vertical angulation of the tube head and the PID begins at zero. In the zero position, the PID is parallel to the plane of the floor.
B) The vertical angulation of the tube head and the PID begins at zero. In the zero position, the PID is parallel to the plane of the floor.
C) The vertical angulation of the tube head and the PID begins at zero. In the zero position, the PID is parallel to the plane of the floor.
D) The vertical angulation of the tube head and the PID begins at zero. In the zero position, the PID is parallel to the plane of the floor.

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