Question: What does the following JavaScript expression do: document.getElementById ( ' foo ' ) ? retrieves an HTML document named 'foo'. assigns 'foo' as the name

What does the following JavaScript expression do: document.getElementById('foo')?
retrieves an HTML document named 'foo'.
assigns 'foo' as the name of the current HTML element.
makes the HTML element with the id of 'foo' accessible for modification.
displays the HTML element with the id of 'foo'.
What does the following JavaScript expression do:

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