Which of the following statement regarding Wiskott aldrich syndrome is TRUE?

Wiskott Aldrich syndrome is caused by mutation in the WASP gene which produces a protein Wiskott Aldrich syndrome protein. WASP gene is located on the sho arm of X chromosome. It is an X linked immunodeficiency disorder Cardinal features are: Thrombocytopenia Recurrent pyogenic and oppounistic infections staing from 6 months of age Eczema of varying degrees staing at about 1 year of age Normal serum levels of IgA and IgE, slightly increased IgG and decreased amount of IgM. Defective T cell function Normal B cell function