Who among the following proposed a two-factor theory of intelligence employing a statistical method called factor analysis?

J.P. Guilford   Arthur Jensen   Charles Spearman Wechsler

Charles Spearman

In 1927, Charles Spearman proposed a two-factor theory of intelligence employing a statistical method called factor analysis. He showed that intelligence consisted of a general factor (g-factor) and some specific factors (s-factors).