Consider the following statements: In shell moulding
1. A single parting plane should be provided for mould
2. Detachable patterns parts and cores could be included
3. Minimum rounding radii of 2.5 mm to 3 mm should be used 4. draft angles of not less than should be used
Which of the above statements are correct?
(a) 1, 3 and 4 only (b) 1, 2 and 3 only
(c) 2, 3 and 4 only (d) 1, 2, 3 and 4