Which of the following best summarizes the research conducted by Baillargeon and others regarding object permanence?

Her research indicates that children do not develop object permanence until at
least 12 months of age.
Her research indicates that children have a sense of object permanence much
earlier than Piaget believed.
Her research indicates that Piaget was correct in his assumptions about the
age at which children develop object permanence.

Her research indicates that children have a sense of object permanence much
earlier than Piaget believed.