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当前学科：期货投资分析
题目：
多选题
假设投资者持有高度分散化的投资组合，投资者可采用（）方法来规避由于非预期的市场价格下降而发生损失的风险。
A
利用股指期货调整整个资产组合的β系数
B
利用看涨期权进行投资组合保险
C
保护性看跌期权策略
D
备兑看涨期权策略
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