For transistor action

(1) Base, emitter and collector regions should have similar size and doping concentrations.

(2) The base regions must be very thin and lightly doped.

(3) The emitter-base junction is forward biased and the base-collector junction is reverse biased.

(4) Both the emitter-base junction as well as the base-collector junction are forward biased.

Which of the following pairs of statements is correct?

(a)   (4) and (1)                                       (b)   (1) and (2)

(c)   (2) and (3)                                       (d)    (3) and (4)

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