Two links \(O A\) and \(O B\) are connected by a pin joint at ' \(O\) '. The link \(O A\) turns with angular velocity \(\omega_{1} \mathrm{rad} / \mathrm{s}\) in the clockwise direction and the link \(O B\) turns with angular velocity \(\omega_{2} \mathrm{rad} / \mathrm{s}\) in the anticlockwise direction. If the radius of the pin at ' \(O\) ' is ' \(r\) ', then the rubbing velocity at the pin joint ' \(O\) ' will be

(a) \(\omega_{1} \cdot \omega_{2} \cdot r\)

(b) \(\left(\omega_{1}-\omega_{2}\right) r\)

(c) \(\left(\omega_{1}+\omega_{2}\right) r\)

(d) \(\left(\omega_{1}+\omega_{2}\right) 2 r\)