The correct option is D muscle tissue
There are two types of glands derived from epithelia: exocrine glands and endocrine glands.
All exocrine glands consist of two components: (1) groups of specialized cells called secretory units that produce the characteristic secretions, and (2) tubular ducts that convey these secretions onto an epithelially-covered surface. Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.