Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The set of portfolios on the minimum-variance frontier that dominates all sets of portfolios below the global minimum-variance portfolio is the:
Option A:capital allocation line.
Option B:Markowitz efficient frontier.
Option C:set of optimal risky portfolios.

Answer: B