Microbes can enter the catheter system through which of the following means? (select all that apply.) a. contamination of the drainage port when emptying the drainage bag. b. making sure the catheter tubing is closed and the red seal is intact. c. performing hand hygiene and wearing gloves before touching the catheter tubing. d. during the process of inserting the patient's catheter. e. placing the drainage bag so that it does not touch the floor.