Read the following passage and answer the five questions that follow:The Wechsler Adult Intelligence Scale (WAIS) was administered to a sample of 300 subjects. The inter-correlations among all the subscales were obtained. Unities were retained in the diagonal spaces of the correlation matrix and it was factor analysed. Cattell's scree indicated two-factor solution. The two factors were subjected to varimax rotation. The two rotated factors were named as Verbal Intelligence and Performance Intelligence. The two factors, together, explained 62 percent of variance. In this research, the factor analysis has

• A. Established the predictive validity of the WAIS.
• B. Explored the dimensionality of the WAIS subscales.
• C. Provided evidence in favour of Spearman's two factor model.
• D. Demonstrated that all the WAIS subscales are highly internally consistent.