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