The MapReduce algorithm contains two important tasks, namely __________.

_____ takes a set of data and converts it into another set of data, where individual elements are broken down into tuples (key/value pairs).

______ task, which takes the output from a map as an input and combines those data tuples into a smaller set of tuples.

In how many stages the MapReduce program executes?

Which of the following is used to schedules jobs and tracks the assign jobs to Task tracker?