For a PA Cranial Projection, the

Multiple Choice

For a PA cranial projection, the
1) midsagittal plane is positioned parallel with the IR.
2) OML is aligned perpendicular to the IR.
3) central ray is aligned perpendicular to the IR.
4) central ray is centered to the nasion.

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