Fama-French 3 Factor Model

Need help with this question, is s and HML necessarily have to be positive?I know that i is correct, what about the other statements?

Not necessarily. If s > 0, then the security is small-cap. If HML > 0, it means value-oriented portfolios outperform growth-oriented.

I think the answer should be iv? The expected value of the error term should be zero.