Consider the numbers $10,20,30,40,$ and $50,$ arriving in that order. You want to output them in this order: $30,20,40,10,50.$ You can use either a single stack or a single queue to store the items when they arrive. You can pop or dequeue items as desired, and which point you display them to output.

i$.$ With a single stack, can you make this happen? $($In other words, when each item arrives, you push it onto the stack. You can apply a pop whenever you want.$)$ If so$,$ how can you achieve the desired output order. If not, why not?

ii$.$ With a single queue, can you make this happen? $($In other words, when each item arrives, you enqueue it onto the queue. You can apply a dequeue whenever you want.$)$ If so$,$ you can you achieve the desired output order. If not, why not?