问题如下：
Compared with the portfolios on the CML, which of the following statements about the portfolio above the CML is correct?
选项：
A. The portfolio above the CML is considered inferior.
B. The portfolio above the CML is considered inefficient.
C. The portfolio above the CML is considered unachievable.
解释：
C is correct.
Any portfolio that plots above the CML is unachievable, and any portfolio that plots below the CML is inferior to any point on the CML.
他是和有效前沿的连接点，那不是在上面的话，不在有效前沿上、应该是无效的啊，为什么选项2，无效不对？