Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at \(1200 \mathrm{rpm}\) and transmits a torque of \(20 \mathrm{~N} \mathrm{~m}\). The torque transmitted by the gear is

(a) \(6.6 \mathrm{Nm}\)

(b) \(20 \mathrm{Nm}\)

(c) \(40 \mathrm{Nm}\)

(d) \(60 \mathrm{Nm}\).