What is the most important precaution to prevent harm that a nurse will teach a patient who is prescribed to take the anticoagulant drug warfarin?

Always take your medication within an hour of the same time every day and never with meals

Avoid taking aspirin or any aspirin-containing product unless prescribed

Apply an ice pack to any body area that you bump or otherwise injure to reduce bleeding

Check with your primary health care provider before taking any vitamin supplements