You create a class library that is used by applications in three departments of your company. The library contains a Department class with the following definition.
public class Department {     
public string name；     
public string manager；   
} 
Each application uses a custom configuration section to store department-specific values in the application configuration file as shown in the following code.

You need to write a code segment that creates a Department object instance by using the field values retrieved from the application configuration file.
Which code segment should you use？（）

A.A
B.B
C.C
D.D