Select an appropriate expression to complete the method below, which is designed to print the element at the bottom of a Stack collection.  The contents of the original stack are restored before the method terminates.  It is safe to assume that the original stack contains at least one element.

public static void printBottom(Stack<String> theStack)

{

   Stack<String> anotherStack = new Stack<>();

   while (!theStack.empty())

   {

      anotherStack.push(theStack.pop());

   } 

   ____________________________

   while (!anotherStack.empty())

   {     

      theStack.push(anotherStack.pop());

   }

}