Question: qux ( [ ] , [ ] ) . qux ( [ X | Xs ] , [ X , X | Ys ] )

qux([],[]).
qux([X|Xs],[X,X|Ys]) :- qux(Xs,Ys).
Which operation does the above Prolog definition perform?
Group of answer choices
concatenates two lists into one
splits a list into two parts at the given element
calculates the sum of a list
sorts a list in ascending order
duplicates the elements in a list

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