challenge: What was the outcome of the SEC's investigation into SAC Capital Advisors in 2013?
  
  A. The firm was required to pay $500 million in penalties, but was allowed to continue operating
  B. The firm was found not guilty of any wrongdoing
  C. The firm paid a penalty of $100 million and was required to cease operations
  D. The firm pleaded guilty to insider trading charges and paid $1.2 billion in penalties
  Answer: 