IQ tests are typically made up of several sub-tests. According to Spearman's two-factor of intelligence, which of the following is true: a. The 'g' factor explains the similarities among sub-tests, while the 's' factor explains the differences

b. The 'g' factor explains the differences among sub-tests, while the 's' factor explains the similarities

c. both 'g' and 's' explain the similarities among sub-tests

d. both 'g' and 's' explain the differences among subtests

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