问题：
[单选题]绝大多数数据库系统的总体结构，都具有外模式、模式和内模式三级模式结构。描述数据库中全体数据的全局逻辑结构和特征的是
A、模式和内模式
B、内模式
C、模式
D、外模式
参考答案：
C
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