Piaget proposed four stages of cognitive development.What is NOT one of his stages

A)  sensorimotor 
B)  formal operational 
C)  preoperational 
D)  postoperational

Postoperational

This key term seems to be a misinterpretation or typo and does not directly align with a widely recognized psychological term. If referring to Piaget's stages, the correct term might be "Concrete Operational" or "Formal Operational."

Piaget

A Swiss psychologist known for his theory of cognitive development that describes how children develop intellectual abilities.

Cognitive Development

The study of how thinking, problem solving, and intelligence evolve from childhood through adulthood.