The nurse refers an older adult client for further evaluation after the nurse assesses warm skin and brown pigmentation around the ankles. The nurse suspects which of the following?

A. Dependent edema is characterized by swelling in the lower extremities due to gravity and may not always present with pigmentation changes. B. Stasis ulceration involves ulcerative lesions typically occurring on the lower legs, often associated with venous insufficiency, but the pigmentation alone does not confirm ulceration. C. Arterial occlusion typically presents with symptoms such as pain, pallor, and decreased pulses, not necessarily with warm skin and brown pigmentation. D. Venous insufficiency is characterized by symptoms such as warm skin, brown pigmentation around the ankles (due to hemosiderin deposition from blood pooling), and swelling.