Problem: A young patient presents with purpura predominantly on the extensor surfaces of the limbs and buttocks following a recent infection. The purpura is raised and palpable, and laboratory tests indicate elevated IgA levels. What is the most likely diagnosis for this patient's condition? Group of answer choices Immune Thrombocytopenia. Henoch-Schönlein purpura Hereditary hemorrhagic telangiectasia Vitamin C deficiency (scurvy)