A researcher was studying an individual with below average intelligence that had extraordinary memory of dates. When given a month, day, and year, the person could tell you about all of the local,...

A researcher was studying an individual with below average intelligence that had extraordinary memory of dates. When given a month, day, and year, the person could tell you about all of the local, national, and international events from that day in history. What would the researcher likely diagnose this person with?

 Autism spectrum disorder

Developmental delay disorder

 Fluid intelligence deficiency

Practical intelligence disorder

or  Savant syndrome