The correct option is: (a) brush bordered
Explanation:
Brush border is the outer surface of columnar epithelial cells lining the intestine and kidney of man. With a light microscope. it appears as a narrow layer with vertical striations. But the electron microscope shows it to be made of fine hairline processes called microvilli. Brush bordered columnar epithelium is highly absorptive and it greatly increase the surface area of the cell tor absorption of dissohed substances.
