Refer to the given circuit. Which of the following equations is correct about the current in this network, according to Kirchhoff's Current Law (KCL)?
1
i1 = i2 + i3 + i4 + i5
2
i1 + i2 + i3 = i4 + i5
3
i1 + i2 + i5 = i3 + i4
4
i1 + i5 = i2 + i3 + i4