What is the difference between Gaussian Blur and Lens Blur, and when would you choose each?

What is the difference between Gaussian Blur and Lens Blur, and when would you choose each?

• A. Gaussian Blur applies even blur; Lens Blur simulates depth of field with a blur model and can use depth map.
• B. Lens Blur is faster and simpler; Gaussian Blur simulates depth of field with depth map.
• C. Gaussian Blur sharpens edges; Lens Blur blurs color channels.
• D. Gaussian Blur reduces noise; Lens Blur increases noise.

Answer: (C)