(A) Tunnel diode is a heavily doped pn junction diode that exhibits negative differential resistance.
(B) Stability factor (S) is the maximum for a voltage divider bias circuit.
(C) The operational amplifier works as a comparator circuit in open loop configuration.
(D) Biasing is done to set the quiescent point of the transistor in the middle of the DC load line.
Choose the correct statements from the options given below:
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Tunnel diodes are special due to their ability to exhibit negative differential resistance.
The statements concerning tunnel diodes, stability factor, operational amplifiers, and biasing are all accurate. Therefore, all statements are true. Final Answer: \[\boxed{(3)}\]