Which is true of the inferior mesenteric artery and its branches?

• A. Inferior mesenteric ends as the superior rectal artery
• B. The main trunk crosses the left ureter, but its branches pass behind it
• C. It arises from the aorta at the level of L2
• D. The descending branch of the left colic supplies the sigmoid colon only
• E. There is very little anastomosis between the branches