Which of the following techniques is used to set an expanded oval?

The technique used to set an expanded oval is the indirect method. This approach involves creating a foundation for shaping the hair while allowing for more control over the final look. In the context of hairstyling, the indirect method refers to techniques that utilize tools or methods that create volume and shape without applying direct pressure or heat to the hair. By working with the natural flow and texture, hairstylists can achieve a harmonious and well-balanced expanded oval shape.

The other techniques mentioned, such as direct, additive, and subtracting, do not specifically align with the requirements of setting an expanded oval. Direct methods often involve applying immediate pressure or control, which differs from the subtlety needed for an expanded oval. Additive techniques may involve layering or building up texture, while subtracting typically refers to removing length or density. Therefore, the indirect method is the most appropriate choice for achieving this particular hairstyle.