In Oldham's coupling the condition for maximum speed ratio is

(a) \(\frac{\omega_{1}}{\omega}=\cos \alpha\)

(b) \(\frac{\omega_{1}}{\omega}=\sin \alpha\)

(c) \(\frac{\omega_{1}}{\omega}=\frac{1}{\cos \alpha}\)

(d) \(\frac{\omega_{1}}{\omega}=\frac{1}{\sin \alpha}\).