For an AP-PA chest projection (right lateral position), the

1. shoulders and the posterior ribs are positioned perpendicular to the cart.
2. humeri are positioned at a 90-degree angle with the IR.
3. midcoronal plane is aligned perpendicular to the IR.
4. patient is elevated on a radiolucent sponge or cardiac board.
a. 1 and 4 only
b. 2 and 3 only
c. 1, 2, and 4 only
d. 1, 2, 3, and 4

A