In 1992,the AAMR made a significant change in the way it visualized mental retardation relative to the DSM.This change involved
A-Reducing the levels of severity from four to three
B-Shifting the base IQ rate from 85 to 70
C-Dropping level of severity in favour of levels of intensity of intervention needed
D-Classification of what was then called MR along five, rather than four, levels of severity