Which statements when inserted independently will throw an exception at runtime? (Choose two.) var x = new

Which statements when inserted independently will throw an exception at runtime? (Choose two.) 

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var x = new LinkedList (); x.offer (18); // INSERT CODE HERE A. B. x. peek (); x.peek(); x. poll (); x.poll(); C. x.pop(); x.pop(); D. x.remove(); x.remove();