Select one: O a. Financial markets are always efficient because investors can always obtain information from big banks O b. Efficient markets as a notion means that, at any point in time, volatility of assets fully reflect all available information OC. CAPM states that prices in financial markets always reflect all available information. Thus, making profit via arbitrage is impossible O d. CAPM states that markets are efficient most of the time but could be efficient sometimes O e. Perfect information and investors' rationality imply that financial markets are inefficient