As a child, Rupert was attacked by a dog. Lately, he has been so scared of dogs that it's been hard for him to leave his home. His therapist recommends that he work on this phobia by starting small - looking at pictures of puppies. He will then work his way up to looking at dogs through a window, and then eventually petting a friendly dog. It sounds like Rupert's therapist is using which technique? electroconvulsive therapy cognitive behaviour therapy pharmacological therapy mindfulness based therapy exposure therapy