Which of the following is true about interfaces: A. Can not contain constants but can have variables. B. None of the items listed. C. All methods in an interface must be abstract. D. A class can only implement one interface. E. An interface can have only non abstract methods.

For the following example of making a peanut butter and jelly sandwich, identify which are inputs, processes, or outputs: bread scooping and spreading peanut butter plate scooping and spreading jelly finished sandwich putting two pieces of covered bread together dirty plate crumbs