Solved
I was a full-time student (12 credit hours) 17 Aug 2016 - 17 Dec 2016. Box 8 (Check if at least half-time student) of my 1098-T is checked. So, on my return, should I report "Full-time" or "At least half-time"?
In TurboTax, you should check "At least half-time" as indicated on your form 1098-T.
For the American Opportunity Credit, "at least half time" is equivalent to "full time".
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