Why Should an Intermittent Catheter Be Flushed Regularly? (Select All

Why should an intermittent catheter be flushed regularly? (Select all that apply.?

A) To prevent the mixing of incompatible medications and solutions
B) To ensure the patency of the catheter
C) To prevent the formation of emboli
D) To open an occluded catheter
E) To replace lost fluids
F) To provide electrolyte replacement