A
A 5-year-old boy who, after 3 months of age, developed recurrent otitis media, pneumonia, diarrhea, and sinusitis, often with simultaneous infections at two or more disparate sites
B
A distinctive-appearing 8-month-old boy with an interrupted aortic arch, hypocalcemia, and cleft palate
C
A 1-year-old boy with severe eczema, recurrent middle-ear infections, lymphopenia, and thrombocytopenia
D
A 9-year-old boy with an eczema-like rash and recurrent severe staphylococcal infections