Which of the following is a debated question regarding intelligence and intelligence testing?

A) whether IQ tests are fair to all groups.
B) the definition of intelligence itself
C) whether IQ tests actually measure intelligence
D) all of the above

All of these questions are debated and argued in the field of intelligence and intelligence testing. The fairness of IQ tests is often challenged due to concerns about cultural bias, while the definition of intelligence is a highly-debated philosophical and psychological issue. Additionally, some researchers question whether IQ tests truly measure intelligence or if they just measure a certain kind of cognitive ability.