What are the components of the preliminary strand test for chemical relaxers?

The correct choice highlights the essential components involved in conducting a preliminary strand test for chemical relaxers, which are crucial for assessing the hair's condition prior to the application of the relaxer.

The porosity test evaluates how well the hair can absorb moisture, which is vital as porous hair typically requires different treatment compared to less porous hair. This understanding helps in determining how the relaxer will interact with the hair. The elasticity test measures the hair's strength and its ability to stretch and return to its original length without breaking. This is important because weak hair that lacks elasticity may not tolerate the chemical process well, leading to damage.

The relaxer test is specifically designed to determine the hair's response to the chemical relaxer. By applying a small amount of the relaxer and observing the hair's reaction, a stylist can evaluate whether the hair can withstand the chemical treatment and how long the relaxer should be left on to achieve the desired outcome without causing excessive damage.

These three tests combined provide a comprehensive assessment of the hair's readiness for chemical relaxation, ensuring that the stylist makes informed decisions tailored to the individual's hair type and condition.