7.(4%) Which statement is true regarding the capital market line?
I. The capital market line is a capital allocation line from the risk-free rate through the market portfolio.
II. The capital market line is the best attainable capital allocation line.
III. The capital market line is also called the security market line.
IV. The capital market line always has a positive slope.
(A)I only
(B) I and II
(C) II and IV
(D)I, II, and IV
(E) I, II, III, and IV