To be honest I thought the question was quite clear. It asked what index SQLSERVER created to support the foreign key. It did not ask what other constraints, which may create indexes on the same column, could YOU add to the rest of the create statement which would also by chance support the FK.

SQLServer does not create any indexes to support FK's, you must do it yourself, so the only possible answer was "None". I disagree with people talking about the question being a play on words or having to read Hugo's mind. It wasn't. I agree you needed to read the question carefully and think about it but heck, it's a question from Hugo so that's just a given 😀

Cheers

Roddy