A nurse is caring for a client who has deep vein thrombosis and has been on heparin continuous infusion for 5 days. The provider prescribes warfarin PO without discontinuing the heparin. The client asks the nurse why both anticoagulants are necessary. Which of the following statements should the nurse make?

"Both heparin and warfarin work together to dissolve the clots."

"I will call the provider to get a prescription for discontinuing the IV heparin today."

"The IV heparin increases the effects of the warfarin and decreases the length of your hospital stay."

"Warfarin takes several days to work, so the IV heparin will be used until the warfarin reaches a therapeutic level."