Which of the following statement is incorrect regarding cuboidal epithelium ?

A. It is an epithelial tissue.

B. It is composed of a single layer of cube-like cells.

C. They are found in the walls of blood vessels and air sacs of lungs.

D. Secretion and absorption are the main functions of these tissue.

Please do not use chat terms. Example: avoid using "grt" instead of "great".