There are three forms of the Efficient Market Hypothesis which differ in respect to the definition of available information. One of these forms called "Weak form" which means that: a. The historical price of a stock provides an unbiased estimated of its future price. O b. None are true C All available information, including insider information is immediately incorporated into the price of securities as soon as it is known leaving no room for excess returns. Od All publicly available information including past prices is assumed to be incorporated into the determination of security prices. Clear my choice