As used in this article, “former testimony” means testimony given under oath in:

1. (a) Another action or in a former hearing or trial of the same action;
2. (b) A proceeding to determine a controversy conducted by or under the supervision of an agency that has the power to determine such a controversy and is an agency of the United States or a public entity in the United States;
3. (c) A deposition taken in compliance with law in another action; or
4. (d) An arbitration proceeding if the evidence of such former testimony is a verbatim transcript thereof.