To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) One - This option is incorrect because a single .NET DLL (Dynamic Link Library) can contain multiple classes. A DLL can serve as a container for multiple classes and other types.
Option B) Two - This option is incorrect because a single .NET DLL can contain more than just two classes. It can contain any number of classes, depending on the complexity and design of the software.
Option C) None - This option is incorrect because a .NET DLL must contain at least one class. A class is the fundamental building block of object-oriented programming in .NET, and a DLL must have at least one class definition.
Option D) Many - This option is correct because a single .NET DLL can contain multiple classes. There is no restriction on the number of classes that can be included in a DLL.
The correct answer is D) Many. This option is correct because a single .NET DLL can contain any number of classes.