Select one option which shows the line number where iteration is first used in the algorithm shown in Figure 1.

Figure 1

1   capacity ← 500
2   current_stock ← USERINPUT
3   IF current_stock < 100 THEN
4       order_qty ← capacity - current_stock
5       SEND_ORDER(order_qty)
6   ELSE IF current_stock < 250 THEN
7       order_qty ← 100
8       WHILE order_qty > 0
9           ADD_TO_PENDING(10)
10          order_qty ← order_qty - 10
11          IF current_stock + order_qty > capacity THEN
12              order_qty ← 0
13          ENDIF
14      ENDWHILE
15  ELSE
16      OUTPUT "Stock levels optimal"
17  ENDIF