How does the progression of interviews differ between regular investigations and undercover investigations?

How does the progression of interviews differ between regular investigations and undercover investigations?
A . In regular investigations, the interview process closes in on the perpetrators over time. Undercover investigations begin with those most involved and work towards those less involved
B. Undercover investigations are not legally covered outside the company
C. Undercover investigations cannot be used to reclaim company assets
D. In regular investigations LE assistance may be necessary. In undercover investigations LE assistance is prohibited unless approved by Legal

Answer: A