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Standardized assessments should be used to evaluate impairment and a range of possible diagnosable disorders whenever possible. However, which of the following norming issues arise?
A. Most behavior checklists and diagnostic interview tools were standardized without children with ASD
B. Most behavior checklists and diagnostic interview tools were standardized with children with developmental delays, but not with ASD
C. It is hard to know whether a child is scoring in the clinical range on an instrument because he or she has ASD or because he or she is experiencing difficulties that the tool measures
D. a and c