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Question 2: (a) Write the application-level removeUnwanted) function below that will remove all unwanted items from the given stack, leaving all other items in the stack in exactly the same order. Assume stack items are of Object type and that the function bool Object:wanted) returns true iff an item is wanted. (3 marks) void removeU nwanted ( Stack & stk ); (b) Give the best and worst time complexity of the removeUnwanted) function. Justify precisely from working principles (i.e. no operation count calculation is needed). State your assumptions, if any. (2 marks) (c) Should a Stack ADT include removeUnwanted)? Justify briefly. (1 mark)