If three currents (I1, I2, I3) are all shown flowing into a node of a circuit, which of the following relationships must be true?

A. I1 = (?I2) (?I3)
B. I1 = I2 + I3
C. I1 = I2 I3
D. I1 = ?I2 ? I3
E. I1 = I2 ? I3


Answer: D

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