Which of the procedures below may be recommended in a token economy? Group of answer choices 1. All options are recommended. 2. Have the learner keep their own token tracking system (e.g., token board) and place a token or a tally by themselves so that supervision and monitoring from the teacher are not required. HINT: Is this appropriate? Can they just deliver tokens to themselves whenever they want? 3. Select the tokens that the learner does not already prefer and do not already act as reinforcers. HINT: Review "objects of obsession". 4. Removing a number of tokens upon problem behavior or when the task criterion is not met. HINT: Can a response cost enhance the effects of a token economy