複選題37. Which of the following statements are true? (A) Stack implements a FIFO (first-in-first-out) policy. (B) Queue implements a LIFO (last-in-first-out) policy. (C) Stack can be realized by deque (double-ended qucue). (D) The Find() operation in a doubly linked list takes O(n) time. (E) The EnqueueO operation in a queue takes O(1) time.