Location$-$Allocation Model involves determination of all the following, except:

a$.$ Which customers $($of existing facilities$)$ should be served by each new facility

b$.$ Which type of products must be produced at each location.

c$.$ Optimum number of new facilities

d$.$ Where new facilities are to be located

Develop a layout "from scratch best describes:

a$.$ Construction$-$type layout algorithms.

b$.$ Break$-$Even Analysis

c$.$ Factor Rating method.

d$.$ Improvement$-$type layout algorithms.