【单选题】
A rate(http_request_duration_seconds_sum[5m)/rate(http_request_duration_seconds_average[5m])
B rate(http_request_duration_seconds_total[5m)/rate(http_request_duration_seconds_average[5m])
C rate(http_request_duration_seconds_sum[5m])/rate(http_request_duration_seconds_count[5m])
D rate(http_request_duration_seconds_total[5m])/rate(http_request_duration_seconds_count[5m])
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