I got it "wrong". Hmmm.
I said you should avoid using 1, 2, & 3 which is correct because you can't even create the names in 1 and 3, therefore you could say you should avoid trying to use them. There was no way to know that the "correct" answer would not include 1 & 3 without guessing what the writer "meant". The writer left that specific part open for interpretation.
The question should have said something more like "Which of these are valid, but you should avoid using when creating a stored procedure?"
Like so many I have seen on this site, this is just another crappy trick question imo. Trick questions are not a good learning tool, and they are degrading. They only serve the purpose of trying to make someone look dumb or lower scores. Stop making questions to be "tricky" and just keep it simple.