The intSales array is declared as follows: Dim intSales() As Integer = {10000, 12000, 900, 500, 20000}. Which of the following loops will correctly multiply each element by 2? The intSub variable contains the number 0 before the loop is processed. 

a. Do While intSub <= 4
intSub *= 2
Loop
b. Do While intSub <= 4
intSales *= 2
intSub += 1
Loop
c. Do While intSub < 5
intSales(intSub) *= 2
intSub += 1
Loop
d. None of the above.