单选题

Choose the best answer.
MySQL Enterprise Monitor Query Analyzer is configured to monitor an instance. Which statement is true?

AThe Query Response Time index (QRTi) is fixed to 100ms and cannot be customized.

BEnabling the events_statements_history_long consumer allows tracking the longest running query.

CAn agent must be installed locally on the instance to use the Query Analyzer.

DThe Query Analyzer can monitor an unlimited number of normalized statements.

EThe slow query log must be enabled on the monitored server to collect information for the Query Analyzer.

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正确答案：A （备注：此答案有误）

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