What type of costs are indirectly related to the project but are necessary for overall operations?

Indirect costs refer to those expenses that are not directly tied to a specific project but are essential for the overall operation of a business. These costs support the business as a whole, rather than a particular project or service. Examples of indirect costs include utilities, administrative salaries, and office supplies. These expenses help facilitate the work of various projects but cannot be directly traced back to one single project.

In contrast, direct costs are expenses that can be directly attributed to a specific project, such as materials and labor. Fixed costs are those that remain constant regardless of the volume of work being performed, like rent or salaries, while overhead costs commonly encompass both indirect costs and fixed costs associated with running the business. Thus, the term "indirect costs" is the most appropriate answer here, as it encapsulates the essence of costs that, while not directly linked to a project, are necessary for the overall functioning and sustainability of the business.