Which of these correctly describes a layer of the skin?
a. The epidermis is simple squamous epithelium in which hair follicles develop and blood vessels expand when we are hot.
b. The subcutaneous layer lies between the epidermis and the dermis. It contains adipose tissue, which keeps us warm.
c. The dermis is a region of connective tissue that contains sensory receptors, nerve endings, and blood vessels.
d. The skin has a special layer, still unnamed, in which there are all the accessory structures, such as nails, hair, and various glands