A two-phase load draws the following phase currens: $i_1(t)=I_m \sin(\omega t – \phi_1), i_2(t) = I_m \cos(\omega t – \phi_2)$. These currents are balanced if $\phi_1$ is equal to
1. $- \phi_2$
2. $\phi_2$
3. $\pi/2 - \phi_2$
4. $\pi/2 + \phi_2$