How did the Supreme Court distinguish between the copyright infringing possibilities of the VCR, in the Sony Betamax case, and the peer-to-peer file sharing network in the Grokster case?

1. The court ruled the peer-to-peer network was promoting/marketing copyright infringement while Sony was not
2. Both were found to be illegally infringing technologies
3. The court ruled that neither Sony nor Grokster were involved in illegal file sharing, despite the fact that users could use their technology for infringing purposes
4. None of these are true