A sandbox is a type of database environment used for:沙箱是一种数据库环境，用于::()?
（A）User acceptance testing用户验收测试
（B）Proofs of concept and to test hypothesesPOC和假设验证
（C）Low budget projects低预算项目
（D）Production backups生产备份
（E）Remote users远程用户 答案解析: 沙盒即独立的环境，不受外界干扰，如DOCKER和虚拟机。
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