Question: what's the domain?

[ilovelili]

Let’s say you are engaged to design a building. The requirement is:

You have a defined amount of land
Your building will have 6 floors.
Each floor will have 4 apartments.

What is your domain here?
a. The requirement of the Building
a. Building
b. Residential Building
c. Building with 70 square meters and 6 floors and each floor have 4 apartments

What I learned in Chapter 1:
*_Certain things we did led to this success.

1. Binding model and implementation as soon as possible. That crude prototype forged the essential link.
2. Cultivating a language based on the model. (Ubiquitous language)
   *_