Which of the following is true with regard to testing of general cognitive ability? Select one: a. The testing of general cognitive ability is unaffected by variables such as poor socio-economic status. b. The use of tests of general cognitive ability in academic contexts through tests like the SAT and GMAT is valid for predicting success. c. Assessment of general cognitive ability also reveals the higher levels of organizational commitment and citizenship behavior seen in individuals with high cognitive ability. d. The results of testing general mental ability are not influenced by a deficit in learning opportunities.