Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.

Normal operation of an NPN bipolar transistor requires the base to be

1.	Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.
A.	positive, negative
B.	positive, positive
C.	negative, positive
D.	negative, negative
Answer» B. positive, positive