A Company Has Developed a Calendar/messaging/paperwork Center That Helps Working

Multiple Choice

A company has developed a calendar/messaging/paperwork center that helps working mothers organize their families' schedules and paperwork. All the mothers who have tried it have loved it, and it is priced comparably to normal planners, although it offers much more.
-The product was developed by gathering focus groups of mothers and asking them what they need and what they wish normal planners offered them. This method of product development most likely:

A) is costly and inefficient
B) is performed by the marketing department
C) subscribes to the marketing concept
D) reduces the barriers to purchasing
E) is a method developed in the last decade