Which of the following best defines a "mand" in the context of verbal operants?
1
A verbal response that is directly controlled by a non-verbal stimulus and is reinforced by a generalized conditioned reinforcer.
2
A verbal behavior that specifies its own reinforcement and is controlled by a motivating operation.
3
A verbal behavior that is controlled by another person's verbal behavior and maintains correspondence with the original verbal stimulus.
4
A verbal behavior that automatically strengthens itself through sensory feedback when it is emitted.