What is the output of the following application? 

A. CatHat CatHat

B. aCataHat HatCat

C. The code does not compile because the stream in concat1() returns an Optional.

D. The code does not compile for a different reason.

E. An exception is printed at runtime.

F. None of the above.

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package exercise; import java.util.*; public class Concat { public String concat1 (List values) { values.parallelStream() .reduce ("a", return (x,y)->x+y, String::concat); } public String concat2 (List values) { return values.parallelStream() .reduce ((w, z)->z+w).get(); } public static void main(String... questions) { Concat c = new Concat(); var list = List.of("Cat", "Hat"); String x = c.concatl (list); String y = c.concat2 (list); System.out.print(x+""+y); }}