In cell I1, use the appropriate function to calculate the total units sold for all orders. In cell I2, use the appropriate function to count how many orders had more than 800 units.
a) SUM(I1), COUNTIF(I2, >800)
b) COUNT(I1), SUMIF(I2, >800)
c) SUM(I1), SUMIF(I2, >800)
d) COUNT(I1), COUNTIF(I2, >800)