A three-phase -connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ? a = 12 30° A, what are the polar expressions for the other phase currents?

• A. I ? b = 12 150° A, I ? c = 12 –90° A
• B. I ? b = 12 120° A, I ? c = 12 30° A
• C. I ? b = 12 30° A, I ? c = 12 120° A
• D. I ? b = 12 90° A, I ? c = 12 90° A