Consider the following statements associated with phase and gain margins.
1. They are a measure of closeness of the polar plot to the \(-1+j 0\) point.
2. For a non-minimum phase to be stable it must have positive phase and gain margins.
3. For a minimum phase system to be stable, both the margins must be positive.

Which of the above statements is/are correct?
(a) 2 and 3
(b) 1 and 3
(c) 1 and 2
(d) 1 alone