Which of the following statement is corre
1. If a rotor is statically balanced it is always dynamically balanced also.
2. If a rotor is dynamically balanced, it must be statically balanced
3. If a rotor is dynamically balanced, it may or may not be statically balanced
4. If a rotor is statically balanced, it may or may not be dynamically balanced.
(a) 1 and 2 only (b) 2 and 4 only
(c) 2 and 3 only (d) 1 and 4 only