DoublyLinkedList L = {A,ER,A} DNode P1, P2, P3; P1 = new DNode(); P2 = new DNode(); P3 = new DNode(); Pl.setF(L); P2.setF( P1.getF().getB()); P2.setB(P1); P3=P2.getF().getB(); Console.WriteLine(P2.getB().getF().getData()); // This will print: Select one: a. A O b. E C. R O d. Error Stack sl contains integers {6,4,2}. If the last integer in is 6, Show the output of the following code: int x = sl.pop(); int y = sl.pop(); int z = sl.pop(); sl.push(x); sl.pushi sl.push( (z); while(!sl.empty(){ Console.Write(sl.pop(); } Select one: a. 462 O b. 642 O C. 246 O d. 624