Which of the following statements describe the basement membrane? (select all that applies)

a. Its thickening deprives the epithelium of the exchange of substances with the adjacent blood-vessel-rich connective tissue.
b. The two layers are the basal lamina and the reticular lamina.
c. Commonly consists of two layers, the basal lamina and the apical lamina.
d. Is produced by both epithelial cells and connective tissue cells.
e. Epithelial cells are anchored to it by hemidesmosomes only.
f. Epithelial cells are anchored to it by desmosomes and adhering junctions.
g. Is composed of collagen fibres.
h. Is composed primarily of elastic fibres.