Which of the following is an accurate statement about insider trading?

A. The legal definition of insider trading is trading in a security after receiving a tip.

B. What constitutes insider trading has been developed on a case-by-case basis under the antifraud provisions of the federal securities laws.

C. Government prosecutors have successfully won all of the insider cases pursued since the Global Financial Crisis.

D. All trading by corporate insiders in their own companies' stock is illegal.