Identify a reason why cosmetologists should be knowledgeable about nail structure and growth

a. It forms a protective barrier that keeps microorganisms from invading and infecting the nail bed.
b. It is translucent & the beige or pinkish color of the nail bed shows through
c. Understanding natural nail structure and growth prepares cosmetologists for advanced nail services
d. Parts of the nail matrix begin to permanently reduce production of new cells as a result of aging