__________ and __________ are two techniques that must be applied by policy to infonnation to eliminate business risk once data is no longer needed__和__是策略必须应用于信息的两种技术，以便在不再需要数据时消除业务风险:()?
（A）Declassification redaction解密修订
（B）Sanitization;recovery清理;恢复
（C）Shredding;expungement切碎;删除
（D）Backup recovery备份恢复
（E）Sanitization, recovery清理、恢复
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