For an AP Atlas and Axis Projection

Multiple Choice

For an AP atlas and axis projection,
1) the mandibular angles and the shoulders are positioned at equal distances from the IR.
2) the acanthiomeatal line is aligned parallel with the IR.
3) a 5-degree cephalad angulation is used.
4) an imaginary line connecting the upper occlusal plane and posterior occiput's inferior edge is aligned perpendicular to the IR.

A) 1 and 4 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 3, and 4 only