What is defined as controlled sections of hair in perming?

The correct choice refers to "base sections" as the defined segments of hair in the perming process that provide a structured and organized approach to applying the perm solution. Base sections are crucial because they allow the stylist to work methodically, ensuring that the perm solution is evenly distributed and that the hair is wrapped around perm rods correctly.

By using controlled base sections, stylists can manage the hair effectively, achieve uniform results, and maintain consistency throughout the entire perming process. This organized approach helps in preventing missed spots and ensures that all strands receive the necessary treatment for the desired curl pattern.

The other terms, while related to hair sectioning, do not specifically define the controlled sections used in the perming technique the way base sections do. Understanding these definitions is important for ensuring proper technique and successful outcomes in chemical texturizing services.