According to the Elaboration Likelihood Model (ELM), what tw…

According to the Elaboration Likelihood Model (ELM), what two things determine whether we will process a message through the central or the peripheral route? When people are using the central route to process a persuasive communication, what will make an appeal more persuasive (which aspects of the advertisement)? When they are using the peripheral route, what will make an appeal more persuasive?