2nd Generation Computers Developed in 1959-64 were Based on:

A. Vacuum Tubes
B. Valves
C. Transistors
D. AI

Brief Facts About Transistors:

A transistor is a basic building block of a binary switch and computer circuits In the digital world. As a light switch on a wall, the transistor cuts off or allows current to pass through it. A advanced CPU can have millions or billions of transistors.