Consider the following statements regarding fixtures employed for holding work pieces during machining
1. The location is based on the 3-2-1 principle
2. The number refer to the pins employed three mutually perpendicular planes to arrest required number of degrees of freedom.
3. Fixture also provides tool guidance.
Of these statements
(a) 1, 2 and 3 are correct
(b) 2 and 3 are correct
(c) 1 and 3 are correct
(d) 1 and 2 are correct