What Is Not One of the Successful Practices the Book

What is not one of the successful practices the book listed that Airbnb implemented after utilizing the Design Thinking Process?

A) Airbnb implemented a process that first starts with a creative hypothesis; then implements a change; and finally reviews how it works
B) Airbnb emphasizes being a pirate to its employees where they go out, test new ideas, and report what they find
C) New employees are encouraged to develop new product features after they have completed their two years of the "Airbnb Patient Experience" Program
D) New employees are sent on a trip during their second week of work to develop personal feedback about Airbnb and reinforce the patient experience focus