I agree with you, but this question is a little hypothetical. Assume that the table has 5000 columns, what would you prefer the first step to be? Option 1: -Expand attribute column - Delete content column In this case, after expanding, you'll have to scroll a lot to the left, little tough, and then delete content column, end result would be storing metadata. Option 2: - Delete content column -Expand attribute column This is most preferable, as you'll see content column in the first column position, delete it and then expand attribute column, end result would be storing metadata. I'd still go with option 2 in terms of ease. My answer would be "Delete content column" for 2nd question.

I think she is right because the solution says you should get the metadata and "solution must NOT store the data of the JSON files". You won't satisfy the second part of the question till you delete the content column first.