Use the Data Given Below to Answer the Following Questions)

Use the data given below to answer the following questions) .
Below is a spreadsheet of purchase orders for a computer hardware retailer. $\begin{array}{|l|l|l|l|l|l|l|l|l|}\hline& \text { A } & \text { B } & C & \mathrm{D}&E&F&G&H \\\hline &\text { Purchase } & & & \\1& \text { Orders } & & & \\\hline 2\\\hline 3 & \text { Supplier } & \begin{array}{l}\text { item }\\\text { Description }\\\end{array} & \begin{array}{l}\text { Item } \\\text { Cost }\end{array} & \text { Quantity } & \begin{array}{l}\text { Cost per } \\\text { Order }\end{array} & \begin{array}{l}\text { AP Terms } \\\text { Months) }\end{array} & \begin{array}{l}\text { Order } \\\text { No. }\end{array} & \begin{array}{l}\text { Order } \\\text { Size }\end{array} \\\hline & \text { Rex } & \text { Graphics } & & & & & \\4&\text { Technologies } & \text { Card } & \$ 89 & 35 & \text { \$3115 } & 20 & \text { AL123 } & \text { Large } \\\hline5 & \begin{array}{l}\text { Rex } \\\text { Technologies }\end{array}& \text { Monitor } & \$ 150 & 15 & \$ 2250 & 25 & \text { AL234 } & \text { Small } \\\hline6 & \begin{array}{l}\text { Rex } \\\text { Technologies }\end{array}&\text { Keyboard } & \$ 15 & 40 & \$ 600 & 15 & \text { AL345 } & \text { Large } \\\hline7 & \begin{array}{l}\text { Rex } \\\text { Technologies }\end{array}&\text { Speakers } & \$ 15 & 20 & \$ 300 & 25 & \text { AL456 } & \text { Small } \\\hline8 & \begin{array}{l}\text { Max's } \\\text { wavetech }\end{array}&\text { HD Cables } & \$ 5 & 10 & \$ 50 & 25 & \text { KO876 } & \text { Small } \\\hline9 & \begin{array}{l}\text { Max's } \\\text { wavetech }\end{array}&\text { Processor } & \$ 278 & 27 & \$ 6950 & 30 & \text { KO765 } & \text { Large }\\\hline10 & \begin{array}{l}\text { Max's } \\\text { wavetech }\end{array}&\text { Hard disk } & \$ 120 & 18 & \$ 2160 & 20 & \text { KO654 } & \text { Small }\\\hline 11\\\hline12&\text { Supplier }&\text { Order Size }&\begin{array}{l}\text { item } \\\text { cost }\end{array} \\\hline13 &\text { Rex Technologies}&\text { Large } &>15\\\hline 14&\text { Max's Wavetech }\\\hline\end{array}$
-Which of the following Database functions calculates the average item cost ordered by Rex Technologies?

A) =DAVERAGEA3:H10,C3,A12:A13)
B) =DAVERAGEA3:H10,C3,A12:B13)
C) =DAVERAGEA3:H10,"Item Cost",A12:A14)
D) =DSUMA3:H10,C3,A12:A13) /COUNTAA4:A10)