Which of the following variable names would NOT be valid in JavaScript?

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In JavaScript, variable names must adhere to certain rules to be considered valid identifiers. One of the critical rules is that variable names can only include letters (both uppercase and lowercase), digits (0-9), underscores (_), and dollar signs ($). However, they cannot begin with a digit and must not contain special characters such as spaces, hyphens, or symbols, other than underscores or dollar signs.

The variable name that fails to meet these criteria is "var#32829." The presence of the hash symbol (#) disqualifies it as a valid identifier, because special characters, except for the underscore and a dollar sign, are not permitted in JavaScript variable names. The other variable names "varName1," "varName_2," and "varName3" all conform to the rules, making them valid identifiers.