The purpose of helical grooves in a twist drill is to1. Improve the stiffness2. Save a tool material3. Provide space for chip removal4. Provide rake angle for the cutting edgeSelect the correct answer using the codes given below :

The purpose of helical grooves in a twist drill is to1. Improve the st

1.	The purpose of helical grooves in a twist drill is to1. Improve the stiffness2. Save a tool material3. Provide space for chip removal4. Provide rake angle for the cutting edgeSelect the correct answer using the codes given below :
A.	1 and 2
B.	2 and 3
C.	3 and 4
D.	1 and 4
Answer» D. 1 and 4