For a PA Oblique Esophagus Projection (RAO Position) with Accurate

For a PA oblique esophagus projection (RAO position) with accurate positioning,

A) the patient is rotated until the midcoronal plane is at a 35- to 40-degree angle with the IR.
B) the central ray is centered to the esophagus at the level of T6 to T7.
C) an 11- × 14-inch (28- × 35-cm) IR is used.
D) the patient drinks barium before the exposure only.