The current state of queue is like:
Which of the following sequence of operations will reverse the sequence of characters in the queue.
1
dequeue(), enqueue(a), dequeue(), dequeue(), enqueue(b), dequeue(), enqueue(c), enqueue(d)
2
dequeue(), enqueue(d), dequeue(), dequeue(), enqueue(c), dequeue(), enqueue(b), enqueue(a)
3
dequeue(), enqueue(b), enqueue(a), dequeue(), dequeue(), dequeue(), enqueue(c), enqueue(d)
4
dequeue(), dequeue(), dequeue(), enqueue(a), enqueue(b), dequeue(), enqueue(d), enqueue(c)