A cultural change that might have exposed the fraud that Enron participated in as it was occurring is: d) the establishment of a whistle-blowing hotline.
Whistle-blowing is a term that is given to the act of making people aware of fraudulent practices. The whistle-blows open up the fraud that was meant to be concealed to the authorities.
So, if a person exposes the fraud that Enron engaged in, then he has engaged in whistle-blowing.
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