The correct option is C Exocrine glands - ductless glands
Glandular epithelial cells are specialised for secretion. They are mainly of two types - unicellular, consisting of isolated glandular cells (goblet cells of the alimentary canal) and multicellular, consisting of cluster of cells (salivary glands).
Glands are again divided into two categories - exocrine (duct glands) and endocrine glands (ductless glands).