which of the following positions may be used to effectively demonstrate the hepatic flexure during radiographic examination of the large bowel

which of the following positions may be used to effectively demonstrate the hepatic flexure during radiographic examination of the large bowel?
1.RAO
2. LAO
3. LPO
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1,2 and 3