The comment you are answering to refers to option 3 in the link that they post. It refers to the first answer to the question in that link, the relevant text is

The comment you are answering to refers to option 3 in the link that they post. It refers to the first answer to the question in that link, the relevant text is: > 3. Offensive to a Reasonable Person: Publication of the private facts in question must be offensive to a reasonable person of ordinary sensibilities. The question is about whether it is illegal to publish a private email.