Which of the following is the code to insert a new node, referenced by newNode, into an empty queue implemented by a SinglyLinkedList with a head and tail references?

A) newNode.next = tail; head = newNode; tail = newNode;

B) newNode.next = tail; newNode = tail; newNode = head;

C) head. next = newNode; tail = newNode;

D) tail.next = tail; tail = newNode; head = newNode;