Increased feed____?

• A. increases tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s life
• B. decreases tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s life
• C. no effect on tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s life
• D. none of the mentioned