$6.$ a$)$ What is the difference between transportation problem and assignment problem? $(2)$

b$)$ What is the difference between Transportation and Transshipment problem? $(2)$

c$)$ What is the difference between Origin node and Transshipment node in shortest route problem? $(2)$

d$)$ What is the similarity between the origin and end node in maximal flow problem $(2)$

e$)$ What is the similarity between general linear programming and Integer Programming? $(2)$