You are a data analyst in a tech startup. You use MapReduce as a programming model in Hadoop to process big data. In the process, the first stage is when you input a file. The next stage is the $$split$,$ then $$map$$ task, then shuffling, followed by the $$reduce$$ task and output. Which of the following happens in the $$map$$ task of MapReduce?

$1$ point

Aggregate a set of results

Give consistent names to pieces of data

Produce a final report

Process data into key value pairs

$19$