Transmissibility is unity at two points.

Which one of the following is true for these two points?

(a) \(\omega / \omega_{n}\) is zero and \(\sqrt{3}\) for all values of damping

(b) \(\omega / \omega_{n}\) is zero and \(\sqrt{2}\) for all values of damping

(c) \(\omega / \omega_{n}\) is unity and 2 for all values of damping

(d) \(\omega / \omega_{n}\) is unity and \(\sqrt{3}\) for all values of damping.