Question 3 1 pts public interface Queue *Returns the number of elements in the queue int size); * Tests whether the queue is empty. boolean isEmpty); Inserts an element at the rear of the queue void enqueue (Object e); *Returns, but does not remove, the first element of the queue, or null if the queue is em pty Object first); *Removes and returns the first element of the queue, or null if the queue is empty Object dequeueO; Consider the following sequence of operations on a Queue that begins empty. Give the return value for each line. If it causes an error, then write ERROR