angulation of the central ray may be required.. in order to project through certtain articulation

angulation of the central ray may be required:
1- to avoid  superimposition of overlying structures
2- to avoid foreshorteningn or self-superimpoition
3- in order to project through certtain articulation
a. 1 only
b. 2 only
c. 1 and 3 only
d. 1,2 and
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