How many changes need to be made to the following stream operation to execute a parallel reduction? 

A. None, it is already a parallel reduction.

B. One.

C. Two.

D. Three.

E. The code does not compile.

F. None of the above.

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var r= new Random(); var data = Stream.generate (() -> String.valueOf(r.nextInt ())) .limit (50_000_000) .collect (Collectors.toSet()); var map= data.stream() .collect (Collectors.groupingBy (String:: length));