what can you use to redress a flat tip screwdriver if worn? grinder torch whetstone they cannot be redressed

what can you use to redress a flat tip screwdriver if worn? grinder torch whetstone they cannot be redressed
Answer
Brief Explanations:
A grinder can be used to reshape and redress a worn - flat tip screwdriver by removing the damaged material and restoring the proper shape. A torch is used for heating and soldering, not for redressing screwdriver tips. A whetstone is mainly for sharpening blades, not for the type of metal - removal and shaping needed for a screwdriver tip. And flat - tip screwdrivers can be redressed.
Answer:
A. Grinder