Marco is studying for an upcoming exam. To prepare, he downloads and reads over the PowerPoints from class, writes summary statements of key ideas from the chapter, and makes flashcards of the important vocabulary words by copying the definitions out of the textbook. Since the exam is worth a large percentage of his grade, he plans his schedule so that he can dedicate the entire evening before the exam to study. Based on learning theory, which of Marco's strategies will result in the most meaningful learning? a-Reviewing the class PowerPoints b-Writing summary statements of key ideas c-Making flashcards from the definitions in the textbook d-Dedicating the entire evening before the exam to studying