A left lateral chest projection with accurate positioning demonstrates

1. no humeral soft tissue in the lung field.
2. no more than a total of 0.5 inch (1 cm) of space between the posterior and/or anterior ribs.
3. the right hemidiaphragm inferior to the left hemidiaphragm.
4. the hemidiaphragms inferior to the eleventh thoracic vertebra.
a. 1, 2, and 4 only
b. 1 and 2 only
c. 3 and 4 only
d. 2 and 3 only

A