कंप्यूटर का आकार बहुत बड़ा था.... , The computer size was very large in ....

Solution

A. First Generation

Explanation

It is obvious that computers developed with more power, reliability, speed and smaller sizes due to the enhancement of technology. First generation computers used 1000s of vacuum tubes that required lot of space made them gigantic in size. Single transistor could replace 1000 vacuum tubes and a single IC chip replaced 1000s of transistors made computers smaller and more speedy.