Final answer:
The correct position is the Dorsal decubitus position, where the patient lies on their back with the face up and a horizontal beam directed to the iliac crest.
Step-by-step explanation:
The position described in the question, where the patient is lying supine on the radiographic table with the Central Ray (CR) directed horizontally to the iliac crest, is known as the Dorsal decubitus position. When a patient is in the supine orientation, they are lying on their back with the face upwards. Decubitus positions typically refer to a patient lying down with a horizontal beam used in radiography. In this case, since the patient is on their back, it contrasts with a ventral decubitus position where the patient would lie on their stomach.