Item Below is a spreadsheet of purchase orders for a computer hardware retailer. A C D Purchase Orders 2 Item Cost per A/P Terms Order Order 3 Supplier Description Cost Quantity Order (Months) No. Size Rex Graphics Card 589 35 $3.115 20 AL123 Large 4 Technologies Rex Monitor $150 15 $2,250 25 AL234 Small 5 Technologies Rex Keyboard $15 40 $600 15 AL345 Large 6 Technologies Rex Speakers $15 20 $300 25 AL456 Small 7 Technologies Max's HD Cables $5 10 $50 25 KO876 Small 8 Wavetech Max's Processor $278 27 $6,950 30 K0765 Large 9 Wavetech Max's Hard disk $120 18 $2,160 20 K0654 Small 10 Wavetech Which of the following Database functions calculates the average item cost ordered by Rex Technologies? DAVERAGE(A4:H10,"item Cost" A12:413) =DAVERAGE(A3:H10.C3.A12 A13) O=DSUMIA3:H10.C3.A12:A13)/COUNTA[A4:A10) DAVERAGE(A3:H10 A3,A12:A13)