C#.NET — Applying an attribute to an assembly: choose the correct syntax.

Introduction / Context:
Assembly-level attributes annotate the entire assembly (not a single type or member). They require a target specifier in attribute syntax.

Given Data / Assumptions:

• Target is the assembly.
• Attribute example: AssemblyDescription.

Concept / Approach:
Assembly attributes use square brackets with a target prefix: [assembly: SomeAttribute(...)]. This is placed typically in AssemblyInfo files or any compilation unit.

Step-by-Step Solution:

Verification / Alternative check:
Place the line in a project’s AssemblyInfo.cs and build; it compiles and appears in assembly metadata.

Why Other Options Are Wrong:
They either omit the target or use invalid delimiters or identifiers.

Common Pitfalls:
Forgetting the target prefix (assembly:, module:, etc.).

Final Answer:
[ assembly : AssemblyDescription("DCube Component Library") ]