Which statement is TRUE about understanding the relationship between brain size and intelligence?

a. The Encephalization Quotient is the preferred method to understand this issue because it accounts for brain size relative to body size.
b. Brain size alone is a reliable indicator of intelligence, as larger brains are always associated with higher cognitive abilities.
c. The brain size and intelligence correlation is consistent across all species, regardless of their evolutionary history.
d. Intelligence is solely determined by the absolute size of the brain, irrespective of other factors.