Regarding alveolar cells, which statement is INCORRECT?

• A. type I pneumocytes repair alveolar epithelium
• B. pulmonary alveolar macrophages are derived from blood monocytes
• C. mast cell membranes bind IgE via Fc portion to heavy chain
• D. APUD (neuroendocrine) cells are of endodermal origin
• E. type II pneumocytes are membranous