The expressions below give current $I$ through an electronic component as a function of applied potential $V$. $I_0$ and $V_0$ are constants having dimensions of current and potential respectively. Which of the following are dimensionally incorrect? (A) $I = I_0(e^{2V/V_0} + 1)$ (B) $I = I_0(e^{V/V_0} - 1)$ (C) $I = I_0 V_0(e^{V/V_0} - 1)$ (D) $I = I_0(V/V_0)(e^{V/V_0} - 1)$