Correct Answer : Option (D) : Both (A) and (B)
Explanation : TTL stands for Transistor-Transistor logic. It is a class of type of digital circuits made up of bipolar junction transistors and resistors. BJT has two types of charge carriers: the first one is the electron and the holes. There are two types of BJTs: NPN and PNP. In TTL, resistors play a very short role, and both logic gating and amplifying functions are carried out by the transistors.
