What is the one area in the list below in which manufacturers do not have to use due care?

The one are in which manufacturers do not have to use due care is : 
using adequate test marketing
They only need to use it in an area where they may unintentionally cause harms to other people

Henri Fayol stressed the value of participative management. Henri Fayol's administration hypothesis is a straightforward model of how administration communicates with the work force. Fayol's administration hypothesis covers ideas extensively, so any business can apply his hypothesis of administration. Today the business group considers Fayol's established administration hypothesis as a significant manual for profitably overseeing staff.