Sylvie asks her brother sam if she can borrow his car. sam says she can if she will first go to the car and retrieve his rihanna cd from his giant cd collection. so that she won’t forget which cd sam wants, sylvie imagines a picture of rihanna in her head while humming the song “umbrella” as she walks to the car. sylvie is relying on which component(s) of working memory to her out?