Final answer:
Persistent Motor or Vocal Tic Disorder is classified as a Neurodevelopmental disorder, a category that includes conditions like Tourette syndrome where involuntary movements and sounds are characteristics.
Step-by-step explanation:
Persistent Motor or Vocal Tic Disorder falls under the category of c. Neurodevelopmental disorders, which include a broad range of disorders relating to the development of the nervous system. These disorders typically manifest early in development, often before a child enters grade school, and they can feature developmental deficits that produce impairments of personal, social, academic, or occupational functioning. Tourette syndrome, a well-known type of tic disorder, is a genetic disorder related to neurological issues, where individuals exhibit involuntary vocal sounds and movements. Relaxation and exercise might help in reducing the symptoms of such disorders.