Final answer:
Fraud investigators are typically involved in creating deposition questions, assessing the sufficiency of document production by the opposition, and aiding in the preparation of production requests because of their case familiarity.
Step-by-step explanation:
Fraud investigators can assist in a case in several ways. They can prepare questions to ask opposing witnesses during depositions, evaluate documents produced by the opposing side to satisfy a production request, and assist in the preparation of a production request due to their knowledge of a case.
In this context, the appropriate answer to the student's question is that fraud investigators can assist in a case by doing all of the listed activities, which are: preparing questions for depositions, evaluating documents for production requests, and assisting in preparing production requests themselves.