According to Piaget, the development of which of the following is the hallmark characteristic of successful completion of the sensorimotor period?

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Object permanence, the understanding that objects continue to exist even when they cannot be observed, is the hallmark characteristic of successful completion of the sensorimotor period according to Piaget's theory of cognitive development. This stage typically occurs from birth to about 2 years of age.

According to Piaget, the Development of Which of the Following