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PDD-NOS, or Pervasive Developmental Disorder, Not Otherwise Specified, is a category used for children who have significant problems with communication and play, but do not meet the criteria for a specific autism spectrum disorder. This may be because they have some symptoms of autism, but not enough to be diagnosed with a specific disorder, or because their symptoms are more mild.

Option A, Intellectual Disability, would not be the correct category for these children because their primary issues are with communication and social skills, not intellectual functioning.

Option B, Childhood Disintegrative Disorder, would not be the correct answer because this disorder is characterized by a severe regression in skills, whereas children with PDD-NOS typically do not experience such a dramatic regression.

Option D, Communication Disorders, would not be the correct answer because this category is typically used for specific disorders such as speech or language disorders,