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？（）
- AA
- BB
- CC
- DD