A three-phase fully-controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power 420 V dc to a three phase, 415 V(line), 50 Hz ac mains. Consider dc link current to be constant. The rms current of the thyristor

a)      119.05 A

b)      79.37 A

c)      68.73 A

d)      39.68 A