Which of the Following Is(are) True Regarding Positioning for the Waters

Which of the following is(are) true regarding positioning for the Waters method for the facial bones?
1) The orbitomeatal line forms a 37-degree angle with the plane of the IR.
2) The mentomeatal line is perpendicular to the IR plane.
3) The coronal plane is perpendicular to the IR plane.

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