Sierra posts a video on YouTube of her dancing to the new Ariana Grande song. When Sierra receives negative comments from a number of users, she asks that YouTube take the content down. YouTube does not respond to the request or edit any of the comments on Sierra's video. If Sierra sues YouTube for internet service provider (ISP) liability, what is the likely outcome?

YouTube is liable as Sierra made a valid request to take the content down that YouTube never responded to

YouTube is liable because YouTube regularly edits comments for defamatory content

YouTube is not liable for ISP liability because it did not write any of the comments itself

YouTube is not liable as ISP's are protected under the "safe harbor" provision