Which of the following actions can be considered unethical according to the board's guidelines?

Accepting clients without a proper consultation is considered unethical according to the board's guidelines because it undermines the fundamental principle of ensuring client safety and satisfaction. A proper consultation is essential to evaluate the client's needs, assess any potential health issues, and create a personalized approach to their services. Failing to conduct this consultation may lead to negative outcomes such as allergic reactions, skin irritations, or dissatisfaction with the services provided. This can harm the client's well-being and reflect poorly on the professional's practice, violating the standards set forth to protect clients within the beauty industry.

On the other hand, providing complimentary services, promoting products, and offering discounts can be part of a healthy business practice as long as they adhere to the guidelines established by the board, showing respect for both the business model and ethical service delivery.