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In the differential amplifier shown in the figure, the magnitude of the common-mode and differential-mode gains are $A_{CM}$ and $A_{d},$ respectively. If the resistance $R_{E}$ is increased, then

                                                                          

  1. $A_{cm}$ increases
  2. common-mode rejection ratio increases
  3. $A_{d}$ increases
  4. common-mode rejection ratio decreases
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