问题如下：
M&M Company is selling a stock at $70. An investor using DDM model to estimate its intrinsic value to be $80. Based on his estimate, he would least likely place a :
选项：
A.short-sale order
B.stop-buy order
C.leveraged position
解释：
A is correct.
If the investor believes the stock is undervalued in the market, the investor should place a stop-buy order or leverage position, which would be probably if the stock moves toward his value estimate.
如果是B：stop buy order（short position）的情况，是不是会有这样的情景：investor以70元每股short sell了这个股票，同时发布stop buy order 80元每股来止损？但是这个情景就跟题目中说的投资者是认为这个股票是undervalue矛盾啊，麻烦举例说下答案B的情景
