The Difference Between the Efficient Markets Hypothesis and the Stronger

The difference between the efficient markets hypothesis and the stronger version of the efficient markets hypothesis is that

A) although both theories hold that financial prices are equal to optimal forecasts, the stronger version holds that the optimal forecast is also the fundamental value of the financial instrument.
B) the efficient markets hypothesis uses adaptive expectations while the stronger version uses rational expectations.
C) according to the efficient markets hypothesis, prices are equal to optimal values only in equilibrium, while according to the stronger version, prices are always equal to optimal values.
D) according to the efficient markets hypothesis, prices are always equal to optimal values, while according to the stronger version, prices are equal to optimal values only when markets are in equilibrium.