When Would a Sterile Endoscope and Accessories Be Used for Performing

When would a sterile endoscope and accessories be used for performing an endoscopy procedure that is normally aseptic,such as a colonoscopy?

A) If the patient has HIV or has received chemotherapy
B) If the scope has been accidentally sterilized
C) If the scope were contaminated and sterility is compromised
D) If the procedure room has not been properly decontaminated before use