$A$ current $I$ is passed for a time $t$ through a number of voltameters. If $m$ is the mass of a substance deposited on an electrode and $z$ is its electrochemical equivalent,then
- A$\frac{m}{zIt} = 1$
- B$\frac{z}{mIt} = \text{constant}$
- C$\frac{I}{zmt} = \text{constant}$
- D$\frac{It}{zm} = \text{constant}$
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