The snippet that filters the filtered set is
A. var t=new FilteredSet(s, {function(s) {return !(x instanceof Set);});
B. var t=new FilteredSet{function(s) {return !(x instanceof Set);});
C. var t=new FilteredSet(s, {function(s) {return (x instanceof Set);});
D. var t=new FilteredSet(s, {function(s) {return x;});
Answer: Option A

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