Which of the following is correct about frontotemporal dementia ( FTD )
a. Pathological processing in the anterior cingulate and insula contribute to behavioral variant FTD
b. FUS is not only associated with FTD , but is also associated with Alzheimer ’ s Disease
c. FTD cannot strike at much younger ages ( e.g. , 30s ), it is limited to the typical 60s and later age group
d. Behavioral variant FTD has clear differentiating symptoms and is not mistaken for psychiatric illness