Gutter Guys is a gutter installation company in Southern California that used to generate most of its sales through telemarketing but now uses direct mail to reach prospective customers. Which of the following most likely explains the reason that Gutter Guys switched from telemarketing to direct mail? a. Federal Trade Commission's Anti-Spam Act b. Robinson-Patman Act c. Clayton Act d. Children's Online Privacy Protection Act e. National Do-Not-Call Registry