When is the earliest point at which the reduce method of a given Reducer can be called?

When is the earliest point at which the reduce method of a given Reducer can be called?
Not until all mappers have finished processing all records.
Excellent ! Your Answer is Correct.
As soon as a mapper has emitted at least one record.
As soon as at least one mapper has finished processing its input split.
It depends on the InputFormat used for the job.

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