"the optimal risky portfolio can be identified by finding:
i. the minimum-variance point on the efficient frontier.
ii. the maximum-return point on the efficient frontier and the minimum-variance point on the efficient frontier.
iii. the tangency point of the capital market line and the efficient frontier.
iv. the line with the steepest slope that connects the risk-free rate to the efficient frontier
a. iii and iv
b. only ii and iii
c. only i and iv
d. only i and ii only."