Which of the following statements best expresses Kirchhoff’s junction rule as it applies to electric current at a circuit node?
a) The algebraic sum of the voltages around any closed loop in a circuit is zero.
b) The algebraic sum of the currents around any closed loop in a circuit is zero.
c) The total current entering a junction equals the total current leaving the junction.
d) The current through each individual branch leaving a junction must equal the current entering the junction.