It is about Bernie madoff case

Why did the SEC fail to detect the Ponzi scheme of Bernie Madoff and what were the consequences of such failure? (AAC) The SEC annually receives more than 10,000 complaints against brokers. The understaffed SEC assigned cuses to investigators who had little experience with Ponzi schemes. B. The SEC had difficulty understanding the complexity of Bernie's operations, c. They gave Bernie the benefit of the doubt because he had an impressive track record with NASDAQ and had assisted the SEC on complex issues. D) All of the above