You are developing an application. The application includes classes named Employee and Person and an
interface named IPerson. The Employee class must meet the following requirements:
it must either inherit from the Person class or implement the IPerson interface.
it must be inheritable by other classes in the application.
You need to ensure that the Employee class meets the requirements. Which two code segments can you use
to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.
sealed class Employee : Person
{
…
}

B.
abstract class Employee : Person
{
…
}

C.
sealed class Employee : IPerson
{
…
}

D.
abstract class Employee : IPerson
{
…
}

Explanation:
sealed – When applied to a class, the sealed modifier prevents other classes from inheriting from it. http://
msdn.microsoft.com/en-us/library/88c54tsw(v=vs.110).aspx