Alan is taking a test and is working on a difficult physics…

Alan is taking a test and is working on a difficult physics problem. In addition to remembering numbers and imagining objects in motion, Alan has to remember formulas that he learned while he was studying earlier in the week and combine these formulas with the numbers he is remembering and the objects that he is picturing. Which of the following components of working memory stores all of this information so that he can put it all together?