What constitutes an act in furtherance of a person's right of petition or free speech in connection with a public issue?

"As used in section 425.16, subdivision (e), an ' "act in furtherance of a person's right of petition or free speech under the United States or California Constitution in connection with a public issue" includes: (1) any written or oral statement or writing made before a legislative, executive, or judicial proceeding, or any other official proceeding authorized by law, (2) any written or oral statement or writing made in connection with an issue under consideration or review by a legislative, executive, or judicial body, or any other official proceeding authorized by law, (3) any written or oral statement or writing made in a place open to the public or a public forum in connection with an issue of public interest, or (4) any other conduct in furtherance of the exercise of the constitutional right of petition or the constitutional right of free speech in connection with a public issue or an issue of public interest.' " (DeCambre v. Rady Children's Hospital-San Diego (2015) 235 Cal.App.4th 1, 12-14.)