The IP joint spaces on finger projections are open and demonstrated without distortion when the

1. central ray is aligned parallel with the IP joint spaces.
2. central ray is aligned perpendicular to the IP joint spaces.
3. IP joints are aligned parallel with the IR.
4. IP joints are aligned perpendicular to the IR.
a. 1 and 3
b. 1 and 4
c. 2 and 3
d. 2 and 4

B