Which of the following is true regarding theories of general intelligence and multiple ...

Which of the following is true regarding theories of general intelligence and multiple intelligences?
 
  a. Howard Gardner proposed a theory of multiple, tightly correlated, intelligences.
  b. Robert Sternberg proposed a four-part theory of intelligence that predicts success.
  c. Purely cognitive abilities, such as verbal, mathematical, spatial, and logical skills, show strong positive correlations with one another.
  d. Abilities involving sensory, motor, and personality factors show strong positive correlations with one another.