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A change in the value of the emitter resistance, $\mathrm{R}_{\mathrm{e}^{\prime}}$ in a difference amplifier

1. affects the difference mode gain $\mathrm{A}_{d}$
2. affects the common mode gain $\mathrm{A}_{c}$
3. affects both $\mathrm{A}_{d}$ and $\mathrm{A}_{c}$
4. does not affect either $\mathrm{A}_{d}$ and $\mathrm{A}_{c}$