6 y/o child has a recent strep infection and now presents with abdominal pain. She has developed a palpable purpura on her buttocks and legs and complains of joint aches. What is the diagnosis and treatment?

a) Henoch-Schönlein purpura; Supportive care
b) Kawasaki disease; High-dose aspirin and IV immunoglobulin
c) Rheumatic fever; Penicillin or amoxicillin
d) Toxic shock syndrome; Antibiotics and supportive care