Which Definition Below Best Defines a State Actor

Which definition below best defines a state actor?

A) any person, group, or organization--whether within a state or across state boundaries--that does not work in, or for, a state
B) a person, group, or organization whose ultimate authority and resources (salary, equipment, etc.) typically come from the fact that they work for, or in, a state
C) a small number of individuals and companies with extraordinary wealth and influence far exceeding most people and even some countries
D) a group that thinks of itself as a political community