I need help for the computer science hw. java .... thanks

What does the 'final' keyword do? a. If it's a variable, you cannot change the value at runtime b. If it's a method, you cannot override the method's implementation c. If it's a method, the method can't be called from a subclass d. Answers A & B e. Answers A, B & C Let's assume you know how to create an instance of an object. The instance name is 'o'. How do you get rid of 'o'? a. Call the destructor method b. o = null; c. o. Destroy () d. End the program .JavaFX: This control is used to display hierarchal data: a. TreeMap b. TreeView c. Root Control d. ComboBox What will be printed with the following code: Integer a = new Integer(1); Integer b = new Integer(3); Integer c = new Integer(2); TreeSet ts = new TreeSet(); ts.add(a); ts.add(b); ts.add(c); System.out.println(ts); a. Will print [3, 2, 1] b. Will print [1, 3, 2] c. Will print [1, 2, 3] d. Will print [3, 1, 2]