Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.
  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.

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Analog Electronics
The typical input stage of an opamp has a

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

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