Please note that this question has multiple correct answers. Which of the following…

Please note that this question has multiple correct answers. Which of the following statements are true regarding Piaget’s formal operational stage of cognitive development?
A. It is the last stage of cognitive development, starting at age 12 and extending into adulthood.
B. It is characterised by abstract and scientific deductive reasoning.
C. It is a way of generating abstract concepts and thinking about them in a very systematic, step-by-step way.
D. Formal operational thought is aimed at resolving an ambiguity; one and only one answer is the goal.