In the supply chain network design model Excel solution, which nodes are selected?

Question $8$ options:

$1)$

Plant $1,$ Warehouse $1,$ and Warehouse $2$

$2)$

Plant $2,$ Warehouse $1,$ and Warehouse $2$

$3)$

Plant $1,$ Plant $2,$ Warehouse $3$

$4)$

Plant $1,$ Plant $2,$ Warehouse $2$