Zara Store Staff Gain as Much as Three Hours in Prime

Zara store staff gain as much as three hours in prime selling time to assist customers at stores. Which of Zara's practices is instrumental in these time savings?

A) Concepts going from ideas to appearances in stores in fifteen days on an average.
B) Three hundred member-strong design teams churning out up to thirty thousand items a year.
C) Ironing clothes in advance and packing them on hangers, with security and price tags affixed.
D) Collecting data from customers on what kind of clothes to stock in stores, using PDAs.
E) Tweaking shipping models through Air France-KLM Cargo to coordinate outbound shipments with return legs loaded with raw materials.