Consider a product-to-plant assignment model with uncertain demands. Let xkij be units of product j produced at plant i if demand scenario k happens. Let dkj be units of product j demand under scenario k. Let yij = 1 if plant i is configured to produce product j; it is 0 otherwise. What are the demand(s)? MathFormular.png 1. 3900 for product 1 2. 1800 for product 1 and 2100 for product 2 3. 1800 for product 1 under scenario 1 and 2100 for product 1 under scenario 2 4. None of the above