Which of the following is NOT one of the five major actors defined in the NIST cloud computing reference architecture?

1. Section 2.1 states the list outright: the reference architecture "defines five major actors: cloud consumer, cloud provider, cloud carrier, cloud auditor and cloud broker". 2. Carrier, auditor and broker all appear in that sentence, so each of them is a real actor. 3. Cloud regulator does not appear anywhere in the architecture. It sounds plausible because auditing is discussed at length, but auditing is done by the cloud auditor, who assesses rather than regulates. 4. Note what an actor is defined to be: "an entity (a person or an organization) that participates in a transaction or process and/or performs tasks in cloud computing". Consumer and provider are the other two. _Source: NIST SP 500-292 "NIST Cloud Computing Reference Architecture" (Sept 2011), section 2.1 "The Conceptual Reference Model"_