Which of the following is NOT one of the four stages of Piaget's Stages of Cognitive Development?

The four stages of Piaget's Stages of Cognitive Development are Concrete Operational, Preoperational, Formal Operational, and Sensorimotor. The stages reflect the evolving cognitive abilities of children as they grow.

The Concrete Operational stage occurs approximately between the ages of 7 and 11 years, where children begin to think logically about concrete events. The Preoperational stage, which typically ranges from ages 2 to 7, is characterized by symbolic thinking and egocentrism. The Formal Operational stage, beginning around age 12 and beyond, is when individuals develop the ability to think abstractly, logically, and systematically.

The term "Post-Operational" is not recognized within Piaget's framework, making it the correct choice for the question. Piaget does not define a stage called "Post-Operational"; thus, it does not fit within his established theory of cognitive development.