Quantitative platelet disorders

Which disorder is associated with autoantibody-mediated destruction of platelets, often presenting with skin and mucous membrane bleeding?

1: Haemolytic Uremic Syndrome (HUS)
2: Thrombotic Thrombocytopenic Purpura (TTP)
3: Immune Thrombocytopenia (ITP)
4: Heparin-induced Thrombocytopenia (HIT)