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 common-source JFET amplifier has

  a high input impedance and a voltage gain less than 1.
  a high input impedance and a very high voltage gain.
  a very high input impedance and a relatively low voltage
  no voltage gain.

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