How Do the Theories of Cognitive Development Proposed by Gisela

How do the theories of cognitive development proposed by Gisela Labouvie-Vief and Jean Piaget compare?

A) Labouvie-Vief argued for complete cognitive development at the formal operations stage,whereas Piaget believed a period of postformal thought was necessary.
B) Labouvie-Vief proposed a stage of postformal thought,whereas Piaget thought cognitive development was complete at the stage of formal operations.
C) Both Labouvie-Vief and Piaget concluded that postformal thought represented the completion of cognitive development.
D) Labouvie-Vief emphasized the importance of concrete operational thought,whereas Piaget emphasized the importance of postformal thought.