Consider the following data for four SKUs that you will store in a block$-$stacking pallet storage system, where qi is the received order quantity for SKU i and zi is the stack height $($in pallets$)$ of SKU i:

SKU

qi

zi

A

$26$

$3$

B

$27$

$2$

C

$12$

$1$

D

$25$

$4$