Final answer:
The correct answer to the student's question is 'a) Initial,' which is the term used for the first hair coloring application. A 'retouch' involves coloring new hair growth, while a 'refresh' application enhances color between full sessions.
Step-by-step explanation:
An initial application refers to the first time the hair is colored. The correct answer is a) Initial. This term is used when a person has never had their hair colored before, or if all previously colored hair has been cut off, and the natural regrowth is being colored entirely for the first time.
On the other hand, a subsequent application would refer to applications following the first. A retouch application is when new growth of hair is colored to match the previously colored hair. A refresh application usually refers to applying color to the mid-lengths and ends of the hair to enhance or maintain the color in between full coloring sessions.