The executives of Dunes Inc. pay equal attention toward maximizing profits of the firm, maintaining the well-being of its employees, satisfying its customers, and preserving the environment. This indicates that Dunes Inc. uses the triple bottom line approach.

The triple bottom line approach focuses on considering social, environmental, and financial factors equally important for the success and sustainability of a business. Therefore, if Dunes Inc. pays equal attention to maximizing profits, maintaining employee well-being, customer satisfaction, and preserving the environment, it indicates that they use the triple bottom line approach.