Which explanation would the nurse give to the spouse of a client who had coronary artery bypass graft (CABG) surgery when asked why there is a dressing on the client's left leg?

A vein in the leg was used to bypass the coronary artery.

A filter is inserted in the leg to prevent embolization.

The arteries in the extremities are examined during surgery.

This is the access site for the heart-lung machine.