What is the test for resolving an anti-SLAPP motion?

Resolving an anti-SLAPP motion is "[a] two-step process. First, the court decides whether the defendant has made a threshold showing that the challenged cause of action is one arising from protected activity. The moving defendant's burden is to demonstrate that the act or acts of which the plaintiff complains were taken 'in furtherance of the [defendant]'s right of petition or free speech under the United States or California Constitution in connection with a public issue,' as defined in the statute. ( 425.16, subd. (b)(1).) If the court finds such a showing has been made, it then determines whether the plaintiff has demonstrated a probability of prevailing on the claim. . . ." (Equilon Enterprises v. Consumer Cause, Inc. (2002) 29 Cal.4th 53, 67.) Rulings on these issues are subject to de novo appellate review. (Rusheen v. Cohen (2006) 37 Cal.4th 1048, 1055 (Rusheen).)