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: a
Explanation: The instanceof operator is used to check the type of an object at run time. The instanceof operator returns a boolean value that indicates if an object is an instance of a particular class.
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