Point out the wrong statement :
All Options are Correct
Excellent ! Your Answer is Correct. All intermediate values associated with a given output key are subsequently grouped by the framework, and passed to the Reducer(s) to determine the final output.
The Mapper outputs are sorted and then partitioned per Reducer
The total number of partitions is the same as the number of reduce tasks for the job
The intermediate, sorted outputs are always stored in a simple (key-len, key, value-len, value) format