According to the in Focus Box "Neurodiversity: Beyond IQ," Intellectual

According to the In Focus box "Neurodiversity: Beyond IQ," intellectual disability is a disorder:

A) characterized by intellectual function that is significantly below average, usually defined as a measured IQ of 70 or below, and which is caused by brain injury, disease, or a genetic disorder.
B) in which scores on the Raven's Progressive Matrices test are consistently 25 percent lower than scores on the WAIS.
C) characterized by above-average spatial intelligence, with IQ scores at the 50th percentile or higher on the performance subtest score on the WAIS.
D) in which scores on the Raven's Progressive Matrices test are consistently 25 percent higher than scores on the WAIS.