Symmetrical components: PE Power Circuit Analysis practice question

A power quality meter on a 480Y/277 V four-wire feeder to a mixed motor and lighting panel records these phase currents (phase sequence abc):

Ia=100∠0∘ AI_a = 100\angle 0^\circ\ \text{A}, Ib=80∠−110∘ A\quad I_b = 80\angle -110^\circ\ \text{A}, Ic=90∠125∘ A\quad I_c = 90\angle 125^\circ\ \text{A}

The magnitude of the negative-sequence current is most nearly:

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