Which would be an intraluminal procedure? Endoscopy, Colonoscopy, Arthroscopy or Esophagoscopy

It is a multiple choice question on an exam I need to figure out and I can't locate the answer anywhere.

Colonoscopy and esophagoscopy, and some endoscopies.

The lumen is the inside of a tube. The esophagus and colon are both tubes. The term "endoscopy" is too general to know - it can refer to either intraluminal or extraluminal procedures.