What indicates the expected data values received by a function in JavaScript?

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The expected data values received by a function in JavaScript are indicated by parameters. When defining a function, parameters serve as placeholders that represent the values or arguments which will be passed to the function when it is called.

For instance, in a function declaration, the parameters are defined within the parentheses following the function name. These parameters allow the function to accept input values, process them, and potentially return a result.

This concept is fundamental in programming, as it enables functions to be flexible and reusable with different inputs. By clearly specifying parameters, the function's expected inputs are documented, helping other programmers (or the same programmer later) understand what kind of data should be provided when the function is invoked.

In contrast, arguments refer to the actual values provided to a function's parameters when the function is called. Labels and variables don't specifically denote the expected data values in this context, making parameters the clear and correct answer here.