问题：
A . It automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.
B . The optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.
C . It adds new, bettor plans automatically as fixed plans to the baseline.
D . The non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.
E . The non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.
● 参考解析
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