Layla's new puppy keeps chewing the bottoms of her favorite curtains. Now, whenever Layla sees the puppy begin chewing, she turns on a device that makes a continuous loud, annoying sound. She will not turn it off until the puppy stops chewing. Layla is using which technique to change the puppy's behavior?
◦ Negative reinforcement
◦ Punishment
◦ Sound therapy
◦ Secondary reinforcement