原版书后有一个题：
Keller tells the Morrisons:
“Diversification is a bedrock investment principle, and there are several tools that can be used to mitigate the risk of a concentrated single stock position.”
Identify and describe three tools Keller is referring to in the above statement.
我记得老师讲课时说将风险的是：买put，构建collar，PVF，bear spead
可是答案说的却是：outright sale， monetization，hedging。（outright这么弱智的行为也可以写在答案里吗 ）
案例说monetization不纯粹是为了将风险，它是为了先降风险然后抵押贷款获得流动性。 hedging才是纯降风险。
考试时我按哪个回答啊
