The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is
(A) zero (B) 0.5
(C) between zero and 0.5 (D) between 0.5 and unity
(A) zero (B) 0.5
(C) between zero and 0.5 (D) between 0.5 and unity