The purpose of helical grooves in a twist drill is to
1. Improve the stiffness,
2. Save a tool, material ,
3. Provide space for chip removal
4. Provide rake angle for the cutting edge
Select the correct answer using the codes given below:
(a) 1 and 2 (b) 2 and 3
(c) 3 an(d) 4 (d) 1 and 4