The question is: **In single point cutting tool, Negative rake angle:** Options: - none of the above - Improves strength of the cutting tool - Both A and B - Improves machinability **Correct Answer:** - **Improves strength of the cutting tool** **Explanation:** A negative rake angle increases the strength of the cutting edge, making the tool more robust and durable, especially when machining hard materials. However, it does not improve machinability; in fact, machinability is generally improved by a positive rake angle. So, select: **"Improves strength of the cutting tool"**.