Question 4: "An unexpected spike or drop in demand can wreak havoc on production schedules, leading to stock outs, inventory pileups and other problems.." (Budd et al, 2012) However, thanks to advances in technology, Demand-Driven Supply Chain (DDSC) have now become a reality. Critically discuss the DDSC and its four supporting pillars. Next, discuss in detail six critica success factors in implementing a true DDSC. You must support your discussions with examples wherever possible