What is the test for a defendant to be successful in an anti-SLAPP action?

means simply that the defendant's act underlying the plaintiff's cause of action must itself have been an act in furtherance of the right of petition or free speech. [Citation.] In the anti-SLAPP context, the critical point is whether the plaintiff's cause of action itself was based on an act in furtherance of the defendant's right of petition or free speech. [Citations.] 'A defendant meets this burden by demonstrating that the act underlying the plaintiff's cause fits one of the categories spelled out in section 425.16, subdivision (e) . . . .' [Citations.]" (City of Cotati v. Cashman (2002) 29 Cal.4th 69, 78 (City of Cotati).)