Consider the following statements in relation to the unconventional machining processes:
1. Different forms of energy directly applied to work piece to have shape transformation or material removal from work surface.
2. Relative motion between the work and the tool is essential.
3. Cutting tool is not in physical contact with work piece.
Which of the statements given above are correct?
(a) 1 and 2 only (b) 1, 2 and 3
(c) 2 and 3 only (d) 1 and 3 only