What is the difference between a vector mask and a pixel mask, and how do you apply each?

What is the difference between a vector mask and a pixel mask, and how do you apply each?

• A. A vector mask affects only color information and not transparency.
• B. A vector mask is edited by painting with grayscale on the layer.
• C. A vector mask uses a path for crisp edges; a pixel mask uses grayscale transparency. To create a vector mask, draw a path and choose Create Vector Mask; to create a pixel mask, click the Layer Mask icon and paint with black/white.
• D. A vector mask and a pixel mask are created the same way.

Answer: (C)