Which item is true regarding epithelium?

A. All epithelium is either eccrine, apocrine, or holocrine.

B. Secretory epithelium is classified as simple or stratified and also using the terms cuboidal, columnar, or squamous to describe the shape of the surface cells.

C. Epithelium covers all free surfaces (inner and outer) of the body and forms the secretory parenchyma of glands.

D. Stratified cuboidal epithelium can be several cells thick.

E. Endocrine glandular epithelium never has associated ducts and exocrine glandular epithelium always has associated ducts.