Final answer:
The correct method for attaching additional hair fiber using a special adhesive is called bonding. The hair matrix contains a layer of basal cells, which are essential for new hair fiber production.
Step-by-step explanation:
The method that describes attaching additional hair fiber to the client's hair using a special adhesive is known as bonding. This technique involves using a glue or adhesive to attach hair extensions directly onto the scalp or natural hair. This process is typically quicker and less costly than other methods such as the 'track and sew' method, which involves sewing hair extensions onto braids, or 'on-the-scalp' and 'off-the-scalp' braiding, which do not utilize adhesives.
When we discuss the hair matrix, we find that the correct answer to what the hair matrix contains is d. a layer of basal cells. These basal cells in the hair matrix are responsible for the production of new hair fibers and are found at the base of the hair follicle.