নিচের কোনটি গ্যালভানিক সেল $\mathrm{Zn}(\mathrm{s}) / \mathrm{Zn}^{2+}(\mathrm{aq}) \| \mathrm{Cu}^{2+}(\mathrm{aq}) / \mathrm{Cu}(\mathrm{s})$ এর বিভব বাড়ায়?

$\text { increase in }\left[\mathrm{Zn}^{2+}\right]$

$\text { increase in }\left[\mathrm{Cu}^{2+}\right]$

$\text { increase in }\left[\mathrm{Zn}^{2+}\right] \text { and }\left[\mathrm{Cu}^{2+}\right] \text { equally }$

$\text { increase in }\left[\mathrm{Zn}^{2+}\right] \text { and decrease in }\left[\mathrm{Cu}^{2+}\right]$