Identify the entries below that are NOT valid .NET Framework namespaces (select all that apply).

Introduction / Context:
Knowing which namespaces actually exist in the .NET Framework is essential for correct using directives, type resolution, and avoiding compile-time errors. This question focuses on spotting invalid or mistyped namespaces.

Given Data / Assumptions:

• Some options list real namespaces; others list common mistakes or near-misses.
• We are to mark entries that are not valid namespaces.

Concept / Approach:
Validate each candidate against commonly used namespaces. For example, processes are under System.Diagnostics (type Process), and drawing sub-namespaces use System.Drawing.Drawing2D, not System.Drawing2D. There is no System.Drawing3D in the BCL.

Step-by-Step Solution:

Verification / Alternative check:
Use an IDE’s object browser or official documentation to confirm exact namespace paths (e.g., GraphicsPath is in System.Drawing.Drawing2D).

Why Other Options Are Wrong:
A and E include legitimate namespaces; D includes a wrong one but omits another; C mixes one real (System.Web) with one fictitious (System.Drawing3D).

Common Pitfalls:
Confusing a type name (Process) with a namespace, and forgetting nested namespace segments like Drawing.Drawing2D.

Final Answer:
System.Process, System.Drawing2D, System.Drawing3D