Below is a spreadsheet of purchase orders for a computer hardware retailer.

$\backslash$table$[[,$A$,$B$,$C$,$D$,$E$,$F$,$G$,$H$],[,\backslash$table$[[$Purchase$],[$Orders$]],,,,,,,],[2,,,,,,,,],[3,$Supplier,$\backslash$table$[[$Item$],[$Description$]],\backslash$table$[[$Item$],[$Cost$]],$Quantity,$\backslash$table$[[$Cost per$],[$Order$]],\backslash$table$[[$A$/$P Terms$],[($Months$)]],\backslash$table$[[$Order$],[$No$.]],\backslash$table$[[$Order$],[$Size$]]],[,\backslash$table$[[$Rex$],[$Technologies$]],\backslash$table$[[$Graphics$],[$Card$]],$$$89,35,$$$3115,20,$AL$123,$Large$],[5,\backslash$table$[[$Rex$],[$Technologies$]],$Monitor,$$150,15,$$$2250,25,$AL$234,$Small$],[6,\backslash$table$[[$Rex$],[$Technologies$]],$Keyboard,$$15,40,$$$600,15,$AL$345,$Large$],[\backslash$table$[[$Rex$],[$Technologies$]],$Speakers,$$15,20,$$$300,25,$AL$456,$Small,$],[8,\backslash$table$[[$Max$\text{'}$s$],[$Wavetech$]],$HD Cables,$$5,10,$$$50,25,$KO$876,$Small$],[9,\backslash$table$[[$Max$\text{'}$s$],[$Wavetech$]],$Processor,$$278,27,$$$6950,30,$KO$765,$Large$],[10,\backslash$table$[[$Max$\text{'}$s$],[$Wavetech$]],$Hard disk,$$120,18,$$$2160,20,$KO$654,$Small$],[11,,,,,,,,],[12,,,,,,,,]]$

To find the largest quantity of items ordered from Rex Technologies, what Excel formula should be used in A$12?$

$\frac{?}{S}=UM(D4$:$D7)$

$=$ COUNT$($D$4$:D$7)$

$=$MAx$(D4$:$D7)$

$=$ COUNTIF$($D$4$:D$10)$