What are the elements of a retaliation claim in the prison context?

^2. A viable retaliation claim in the prison context has five elements: "(1) An assertion that a state actor took some adverse action against an inmate (2) because of (3) that prisoner's protected conduct, and that such action (4) chilled the inmate's exercise of his First Amendment rights, and (5) the action did not reasonably advance a legitimate correctional goal." Rhodes v. Robinson, 408 F.3d 559, 567-68 (9th Cir. 2005).