6. You track the liquidity of companies and find that you can consistently earn unusually high returns by purchasing the shares of firms whose stock price falls below the cash value per share as indicated on the published balance sheet. Which of the following must be true? a This is not a violation of market efficiency b This is not a violat ion of weak form efficiency. c. This is a violation of the semi-circular form of efficiency. d This is a violation of semi-strong form efficiency e. This would be a violation of all forms of market efficiency