A change in the value of the emitter resistance, $\mathrm{R}_{\mathrm{e}^{\prime}}$ in a difference amplifier
- affects the difference mode gain $\mathrm{A}_{d}$
- affects the common mode gain $\mathrm{A}_{c}$
- affects both $\mathrm{A}_{d}$ and $\mathrm{A}_{c}$
- does not affect either $\mathrm{A}_{d}$ and $\mathrm{A}_{c}$