Strong-Form Market Efficiency States That the Market Incorporates All Information

Strong-form market efficiency states that the market incorporates all information into stock prices.Strong-form efficiency implies that:
I.an investor can only earn risk-free rates of return;
II.an investor can always rely on technical analysis;
III.an insider or corporate officer cannot outperform the market by trading on the inside information

A) I only
B) II only
C) III only
D) I,II,and III