Kirchhoff's Junction Rule Practice Test

At junction $J$, currents $I_A=0.40,\text{A}$ and $I_B=0.70,\text{A}$ enter from the left and from below. Currents $I_C$ leaves upward and $I_D=0.50,\text{A}$ leaves to the right (directions as labeled). Which current relationship must be true?

At junction $J$ in a DC circuit, current $I_1=2.0,\text{A}$ enters $J$ from the left and $I_2=1.5,\text{A}$ enters from above. Current $I_3$ leaves $J$ to the right, and current $I_4=0.5,\text{A}$ leaves downward. Directions are as labeled. Which current relationship must be true?