What bias conditions must be present for the normal operation of a transistor amplifier?

A. The emitter-base junction must be reverse biased, and the collector-base junction must be forward biased.
B. The emitter-base junction must be forward biased, and the collector-base junction must be reverse biased.
C. Both junctions must be reverse biased.
D. Both junctions must be forward biased.

Homework.

Think it through. What condition is necessary for the variable control of conduction.

B.