After applying pneumatic compression devices to bilateral lower extremities on a patient who is on bedrest, the patient asks what the purpose is of the device. How should the nurse respond to best address the patient's question?

"These help to get rid of clots that are in your legs that can cause problems."

"These help circulate air and provide compression to your legs."

"These will help you to perform passive range of motion to your legs."

"These will help to reduce the risk of developing a venous thrombus."