Which one of the following is TRUE regarding endocrine glands?

A) As the body matures, endocrine glands develop from specialized exocrine glands.
B) Endocrine glands empty their products into a duct.
C) Examples of endocrine glands include sweat glands and salivary glands.
D) Endocrine glands are connective tissues that are specialized to produce and secrete a product.
E) Endocrine glands produce and secrete hormones.