In the Presence of a Risk-Free Asset, the Investor's Job

Multiple Choice

In the presence of a risk-free asset, the investor's job is to:
I. invest in the market portfolio
II. find an interior portfolio using quadratic programming
III. borrow or lend at the risk-free rate
IV. read and understand Markowitz's portfolio theory

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