Which of the following describes individuals treated as employees but are not formally employed?

The correct answer describes individuals who provide their services without formal employment status, which applies to volunteers. Volunteers contribute their time and effort freely, usually in support of a cause or organization, without expectation of compensation or formal employment benefits. They may have similar responsibilities as employees and can be held to certain standards, but they do not receive a paycheck for their work.

Interns, while often seen in a similar light, are usually in a structured program intended to provide them with experience in a particular field, often with some form of compensation or academic credit. Contract workers are individuals who are hired for specific projects or a designated time frame under the terms of a contract, usually with a fee agreed upon for their services, reflecting a more formal working relationship. Part-time workers are employed but work fewer hours than full-time employees, typically receiving hourly wages and benefits associated with their roles, further distinguishing them from unpaid volunteering.