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When testing for giftedness with the WISC-IVthe results may be used to obtain a General Ability Index
(GAI) score which is based on:
a. The child's performance on the Verbal Comprehension subtests and the Processing Speed subtests
b. The child's performance on the Perceptual Reasoning subtests and the Working Memory subtests
c. The child's performance on the Verbal Comprehension subtests and the Perceptual Reasoning subtests
d. The child's performance on the Working Memory subtests and the Processing Speed subtests