Consider the following statements for completely balancing a single rotating mass
1. Another rotating mass placed diametrically opposite in the same plane balances unbalanced mass
2. Another rotating mass placed diametrically opposite in a parallel plane balances the unbalanced mass
3. Two masses placed in two different parallel planes balance the unbalanced mass
Which of these statements is/are correct?
(a) 1 only (b) 1 and 2
(c) 2 and 3 (d) 1 and 3