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

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

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Decrease in input impedance & increase in output impedance
Increase in input impedance & decreases in output impedance
Decreases in both input & output impedances
Increase in both input & output impedances

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