When I execute the command given in the question, I get the following error:
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near ','.
That's because you need to specify the database name in order to use the Repair_Fast option. So I choose answer 1, which was - to my surprise - incorrect.
edit: I see vk-kirov has already said the same thing. Whoopsie.
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MCSE Business Intelligence - Microsoft Data Platform MVP