A nurse is caring for a client who is postoperative following vascular surgery. Which of the following manifestations should indicate to the nurse that the client has developed a thrombus?

A. Homan's sign (calf pain on dorsiflexion of the foot) is no longer considered a reliable or safe diagnostic indicator of thrombus. B. Kernig's sign is associated with meningeal irritation, not thrombus formation. C. Dull, aching calf pain, especially with warmth, swelling, or redness, is a classic manifestation of a deep vein thrombus (DVT). D. A soft, pliable calf muscle is a normal finding and does not indicate thrombus formation.