Which of the Following Is Generally True About the Regulation

Which of the following is generally true about the regulation of user content on social media platforms?

A) the U.S. government cannot, consistent with the First Amendment, require platforms to prohibit hateful user content
B) platforms voluntarily combat hateful user content by creating their own site rules regarding user content
C) a platform's content rules often differ from the principles of First Amendment doctrine
D) all of the above
E) A & B