Julian, a 59-year-old patient with a longstanding history of type 2 diabetes, presents with a chronic, non-healing wound on his foot. The wound is located on the lateral aspect of the foot, characterized by a sharply demarcated, circular margin, and a pale, dry base with minimal exudate. His medical history includes poorly controlled hypertension and intermittent claudication. What is the most likely classification of this ulcer?

A) Venous ulcer

B) Mixed arterial-venous ulcer

C) Pure arterial ulcer

D) Neuropathic ulcer

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