You are trying to understand the different cloud models. Which of the following are advantages of using the private cloud?

Answer options:

A.Less Flexibility
B.Better security
C.High scalability
D.Less costs

Answer – B 
The advantages of using the private cloud is given in the Microsoft documentation. 

Option A - Customer has got the option to customize the environment based on business needs.
Option C - It is an option available with private cloud, but comes at an huge capital expenses.
Option D - Since the environment is specific to a customer, the costs is high.Reason, scaling of environment is done on business requirement and once the requirement is done cannot scale down since the infrastructure has been purchased. 
For more information on comparing the different models, please visit the below URL- 

https://azure.microsoft.com/en-us/overview/what-are-private-public-hybrid-clouds/