How to calculate the broadcast domain and collision domain?

Consider the following network as shown in Figure Q3.
Figure Q3
1)How many collision domain and broadcast domain for the data flow in the networks of 
Figure Q3?
2)In the networks of Figure Q3 if hubs are replaced by switches. How many collision domain 
and broadcast domain for the data flow?
3)In the networks of Figure Q3 if switches are replaced by hubs. How many collision domain 
and broadcast domain for the data flow?