How Can the Positioning Setup Be Adjusted for an AP

Multiple Choice

How can the positioning setup be adjusted for an AP shoulder projection to demonstrate uniform density throughout the shoulder and clavicular areas?
1) Position the top of the shoulder at the cathode end of the tube.
2) Place a compensating filter over or under the laterally located acromion and clavicular end.
3) Use a kilovoltage above 75.
4) Use a grid.

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