Which of the following statements are true? A) An SEList uses a doubly-linked list to store its blocks, whereas a RootishArrayStack uses an ArrayList to store its blocks. B) Both an SEList and a RootishArrayStack have all their blocks of the same length. C Both an SEList and a RootishArrayStack use only an array to store elements in each individual block. D) A RootishArrayStack always fills all but the last two blocks, whereas an SEList may have more than two blocks with extra space Select one: O a. B), C) and D O 6. A) and D) O c.A), B), C) and D) O d. B) and D) O e A) and C)