NO.PZ2018070201000058
问题如下：
The point of tangency between the capital allocation line (CAL) and the efficient frontier of risky assets most likely identifies as the:
选项：
A.optimal riskly portfolio.
B.market portfolio.
C.global minimum-variance portfolio.
解释：
A is correct
The optimal risky portfolio is at the point of tangency between the capital allocation line and the efficient frontier of risky assets..
如题，按照我自己的理解，CAL是risk-free asset 与EF的切点连成的线，切点是risky asset portfolio，CML是risk-free asset 与EF的切点（切点是market portifolio）连成的线，是众多CAL中的最优解，只有这条线与Investor Utility有切点，但切点有没有定义，麻烦您解答一下，谢谢
