C#.NET structs — Which of the following statements are correct? 1) A struct can contain properties. 2) A struct can contain constructors. 3) A struct can contain protected data members. 4) A struct cannot contain methods. 5) A struct cannot contain constants.

Introduction / Context:
Value types (structs) in C#.NET support a rich set of members, though they have some limitations compared to classes. This item asks which features are permitted in a struct definition.

Given Data / Assumptions:

• We consider typical C# (struct as a value type, sealed by nature).
• We evaluate five claims about what a struct may contain.

Concept / Approach:
Structs can contain fields, properties, methods, operators, events, indexers, and constructors. They cannot declare a protected member because structs cannot be inherited. They can define constructors, but historically user-defined parameterless constructors were disallowed until newer language versions; parameterized constructors are always allowed. Structs can include constants (const members).

Step-by-Step Solution:

Verification / Alternative check:
Create a sample struct with a property, a parameterized constructor, a method, and a const; it compiles. Attempt to mark a member protected; the compiler rejects it.

Why Other Options Are Wrong:

• 3, 4 and 3, 5: Depend on invalid claims about protected, methods, or constants.
• 1, 2, 4: Includes the false statement 4.
• None of these: Not correct because 1 and 2 are valid.

Common Pitfalls:
Assuming structs are too restricted; they are feature-rich but simply non-inheritable.

Final Answer:
1, 2