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You know, lots of people are engaged in this question as well. By the way, I assume the law is one of the most important aspects. I once found this article <a href=https://www.natlawreview.com/article/preparing-to-testify-response-to-sec-subpoena>https://www.natlawreview.com/article/preparing-to-testify-response-to-sec-subpoena</a>; where there is information about how to prepare to testify response to SEC Subpoena. You may also try to learn more about it.