The x-ray tube head must be swiveled from side to side to adjust the vertical angulation of the central ray. To avoid overlap error the central ray must be directed perpendicular to the curvature of...

The x-ray tube head must be swiveled from side to side to adjust the vertical angulation of the central ray. To avoid overlap error the central ray must be directed perpendicular to the curvature of the arch through the contact points of the teeth.

a. Both statements are true.

b. Both statements are false

c. The first statement is true. The second statement is false.

d. The first statement is false. The second statement is true.