What are the two variables associated with loop commands ‘Each Row in a CSV/TEXT File’ and ‘Each Row in an Excel Dataset’?

What are the two variables associated with loop commands ‘Each Row in a CSV/TEXT File’ and ‘Each Row in an Excel Dataset’?
A . $Filedata Column$ and $Excel Column$
B . $Dataset Column$ and $Excel Column$
C . $Dataset Column$ and $Table Column$
D . $Filedata Column$ and $Dataset Column$

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Answer: A