_________ corresponds to the millis field returned by cursor.explain()

corresponds-to-the-millis-field-returned-by-cursor-explain

_________ corresponds to the millis field returned by cursor.explain() in earlier versions of MongoDB.

A. executionMillis

B. executionTimeMillis

C. timemillis

D. all of the mentioned

The question was asked during an online interview.

I would like to ask this question from Optimization Strategies in division Monitoring MongoDB and Optimization Strategies for MongoDB of MongoDB

Correct choice is B. executionTimeMillis

Easy explanation: explain.executionStats.executionTimeMillis is total time in milliseconds required for query plan selection and query execution.