A . CHECK（（CreditLimt=0 AND Verified=0）OR（CreditLimt BETWEEN 1 AND 10000 AND Verified=1）
B . CHECK（CreditLimt BETWEEN 1 AND 10000）
C . CHECK（Verified=1 AND CreditLimt BETWEEN1 AND 10000）
D . CHECK（CreditLimt=0 ANDV erified=0）AND（CreditLimt BETWEEN 1 AND 10000 AND Verified=1）
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