Case $1$: A company needs to determine which investment alternative$($s$)$ to pursue from the list: PE $($Plant Expansion$),$ WE $($Warehouse Expansion$),$ DE $($Distribution Expansion$).$

Case $2$: A cell phone manufacturer needs to determine how many units to Produce $($internally$)$ and how many units to Outsource.

Choose the correct variables for each case.

Case $1$: $PE,WE,DE=1,0.$ Case $2$: $P,O0$

Case $1$: PE$,$ WE$,DE=1,0.$ Case $2$: $P,O0$ AND INTEGER

Case $1$: PE$,$ WE$,$ DE $>=0.$ Case $2$: $P,O0$ AND INTEGER

Case $1$: PE$,$ WE$,$ DE $>=0$ AND INTEGER. Case $2$: $P,O=1,0$