What is focus stacking and when would you use it in commercial photography?

What is focus stacking and when would you use it in commercial photography?

• A. Combining multiple exposures to create HDR.
• B. Increasing resolution by stacking RAW frames.
• C. Combining multiple focused shots to extend depth of field; used for macro product shots or jewelry.
• D. Stacking frames to reduce motion blur.

Answer: (C)