The correct answer is option (4) as • The simple squamous epithelium is involved in functions like forming a diffusion boundary and is found in the walls of blood vessels. • The main function of ciliated epithelium is to move particles in a specific direction over the epithelium and is present in the inner surface of fallopian tubes. • Goblet cells of the alimentary canal are examples of unicellular glands which consist of isolated glandular cells. • Compound epithelium is made of more than one layer of cells and is found in the inner lining of pancreatic ducts.