Which option is true about the process$-$chain$-$network $($PCN$)$ analysis?

a$.$

Linear programming works well when analysing the effects of holding inventories, using overtime and engaging in subcontracting.

b$.$

It describes high customer interaction; in the services industry, it means there is a moment of truth when the relationship between the provider and the customer is crucial.

c$.$

It aggregates plans in which production is uniform from period to period.

d$.$

It focuses on how processes can be designed to optimise the interaction between organisations and their customers.