In the context of expected utility theory, take as given a utility function where u(100) = -40, u(200) = -15, and u(300) = 0. Which of the following statements is correct?

1. The utility function is inadmissible because the utility of wealth cannot be negative
2. The utility function is non-standard because it implies that more wealth is worse than less wealth
3. The utility function could be a utility function for a risk averse investor
4. The utility function could be a utility function for a risk-neutral investor
5. All of the above
6. None of the above