A variable, opposite external potential $(E_{ext})$ is applied to the cell $Zn|Zn^{2+} (1 M) || Cu^{2+} (1 M) | Cu,$ of potential $1.1\; V$. When $E_{ext} < 1.1 V$ and $E_{ext} > 1.1 V,$ respectively electrons flow from :

Question

$\begin{array}{1 1} \text{anode to cathode and cathode to anode} \\ \text{cathode to anode and anode to cathode}\\ \text {cathode to anode in both cases} \\\text{anode to cathode in both cases} \end{array} $