This comic is illustrating both classical and operant conditioning. Can you identify both?

For classical conditioning, notice in the last panel, Eno (the man in the comic) is salivating. Identify the unconditioned stimulus, the unconditioned response, the conditioned stimulus, and the conditioned response.

For operant conditioning, his behavior is running out to the street. Is that behavior being positively reinforced, negatively reinforced, positively punished, or negatively punished. Explain.

Just like in classical conditioning, we can have a discriminative stimulus in operant conditioning. What would you guess the discriminative stimulus does in operant conditioning? What is the discriminative stimulus in this comic?