Answer
It is impossible for the net electric field to be zero at point 1.
Work Step by Step
We can draw a Gaussian cylinder through point 1.
According to Gauss' law: $~~\epsilon_0~\Phi = q_{enc}$
Then:
$\epsilon_0~E~(2\pi~r~h) = q_{enc}$
$E = \frac{q_{enc}}{2~\epsilon_0~\pi~r~h}$
Since $q_{enc} = q_A = +3~q_0$, then $E \neq 0$
It is impossible for the net electric field to be zero at point 1.
