Sodium-potassium pump transports 

${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ in the same direction

${\mathrm{Na}}^{+}$ out of the cell and ${\mathrm{K}}^{+}$ into the cell

${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ only down their concentration gradients

${\mathrm{Na}}^{+}$ into the cell and ${\mathrm{K}}^{+}$ out of the cell