In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
(A) R3 is open
(B) R1 is open
(C) R2 is open
(D) the circuit is operating properly
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