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
Conventional biasing of a BJT has

  EB reversed biased and CB reversed biased.
  EB forward biased and CB reversed biased.
  EB forward biased and CB forward biased.
  EB reversed biased and CB forward biased.

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