Which of the following practices is part of "nail technology"?

The practice of nail technology specifically focuses on the care and enhancement of nails, which includes services such as manicure and pedicure procedures, applying artificial nails, and nail art. Applying acrylic nails is a central practice in this field, as it involves sculpting and attaching acrylic material to the natural nail for aesthetic purposes and to improve durability. This directly reflects the goals and skills associated with nail technology.

In contrast, trimming hair, performing facials, and skin treatment procedures relate to other areas within cosmetology. Hair trimming pertains to hair styling and cutting, while facials and skin treatments are focused on skin care and esthetics. These practices fall under different specializations and do not align with the specific definition of nail technology. Therefore, the application of acrylic nails stands out as the correct response within the context of nail technology.