Q:
You are developing a Microsoft Dynamics 365 application. The application includes a 'Vehicle' class and several derived classes such as 'Car', 'Bus', and 'Truck'.

You need to ensure that certain methods in the 'Vehicle' class can be overridden in the derived classes.

What should you do? Each correct answer presents part of the solution. Choose two.

A Declare the methods in the 'Vehicle' class as virtual.
B Declare the methods in the 'Vehicle' class as overridable.
C Declare the methods in the 'Vehicle' class as static.
D A AND B ONLY
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Answer: D

Explanation:

Wrong: Declare the methods in the 'Vehicle' class as sealed.

Wrong: Declare the methods in the 'Vehicle' class as final.

Wrong: Declare the methods in the 'Vehicle' class as static.

Options C and D are correct because declaring a method as virtual or overridable allows it to be overridden in a derived class. Option A is incorrect because declaring a method as sealed prevents it from being overridden. Option E is incorrect because static methods belong to the class itself, not an instance of the class, and cannot be overridden. Option B is incorrect because final methods cannot be overridden in a derived class.

Object-oriented programming - Visual Basic | Microsoft Learn

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