Which of the Following Statements About the Security Market Line

Which of the following statements about the Security Market Line are correct?
I. The intercept point is the risk-free rate of return.
II. The slope of the line is beta.
III. An investor should accept any return located above the SML line.
IV. A beta of 1.0 indicates the risk-free rate of return.

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