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6. Two resistors R1 = 6 Ohm and R2 = 12 Ohm are connected in parallel to each other and in series to R3 = 2 Ohm. An ammeter measures an electric current of 3 A flowing through resistor R3. What is the net voltage applied to the circuit?

A. 6 V
B. 12 V
C. 18 V
D. 24 V​