A nurse is caring for a client who has thrombophlebitis and is receiving a continuous infusion of heparin. The client asks the nurse how long it will take for the heparin to dissolve the clot. Which of the following responses should the nurse make?

"Heparin prevents new clots from forming rather than dissolving established clots."

"It usually takes at least 2 to 3 days for heparin to dissolve a clot."

"The time it takes heparin to dissolve clots varies between clients."

"The time it takes for heparin to dissolve a clot depends on the size of the clot."