What Rana is demonstrating a basic understanding of is what is called object permanence.
What is object permanence?
This can be described as the basic understanding that a child has that things can still be seen or heard even though they are no longer in view.
They are able to tell that these things are still in existent even if it is no longer within range.
Read more on object permanence here:
https://brainly.com/question/4667602
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