Epithelial tissue is the correct characterization of skin glands because these glands are composed of specialized epithelial cells that perform various functions, including secretion. Skin glands, such as sweat glands and sebaceous glands, are derived from epithelial tissue and are located within the dermis, extending into the epidermis.
Epithelial tissue serves as a protective barrier and is involved in the synthesis and secretion of substances, which is fundamental to the function of skin glands. The arrangement and specialization of epithelial cells allow them to effectively produce and release sweat, oils, and other substances necessary for maintaining skin health and homeostasis.
The other types of tissue, such as connective, nervous, and muscle tissue, have distinct roles that do not directly involve the specific functions of glandular secretion in the skin. For instance, connective tissue provides support and nourishment, nervous tissue is responsible for the transmission of signals, and muscle tissue enables movement, which do not pertain to the glandular functions of the skin.