Consider the following: The purpose of lapping process is
1. to produce geometrically true surface
2. to correct minor surface imperfections
3. to improve dimensional accuracy
4. to provide very close fit between the constant surfaces
Which of the above are correct?
(a) 1, 2 and 3 only (b) 1, 3 and 4 only
(c) 2, 3 and 4 only (d) 1, 2, 3 and 4