Which of the following choices would most likely be considered an "employee" rather than an independent contractor or other designation?

Which of the following choices would most likely be considered an "employee" rather than an independent contractor or other designation? 

1. A volunteer at a not-for-profit agency.
2. An unpaid intern at a large corporation.
3. A paid intern at a large corporation.
4. A small business owner who is a "passive investor" (does not participate in the operation of the business).
5. Two of the other answer choices are correct (both types of interns).