Analog Electronics
In all base driver amplifiers

ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
None of these
ac collector voltage is 180° out of phase with ac base voltage

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Analog Electronics
The typical input stage of an opamp has a

  differential input and differential output.
  differential input and single - ended output.
  single - ended input and differential output.
  single - ended input and single-ended output.

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