Belinda is a 46-year-old patient with a history of diabetes presents with a non-healing ulcer on the plantar surface of the foot. Upon examination, the therapist notes a well-defined ulcer with a punched-out appearance surrounded by callused skin. Which type of ulcer is this most indicative of?

A) Venous stasis ulcer

B) Arterial insufficiency ulcer

C) Neuropathic ulcer

D) Pressure ulcer

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