Consider the following declarations and figure when answering this question. class queue_node [ public: int data; queue_node "prev. "next; 1: class Queue public: void enQueueint): void de Queuel): private: queue_node "back: : pack pack Bk2146196205 What is the contents of the queue after the following operations have been performed? deQueuel): enQueue(10): deQueuel): 10 2 6 9 20 26 9 10 None 69 20 10