(单选题)3: （ ）是根据资本市场环境及经济条件对资产配置状态进行动态调整，从而增加投资组合价值的积极战略。
A: 买入并持有策略
B: 恒定混合策略
C: 投资组合保险策略
D: 动态资产配置策略
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