Beginning in the 1940s, first-generation computers used circuitsvacuum tube technologylaser technologytransistors

Vacuum Tube Technology

Explanation:

During the periods between 1940 and 1956, 1st generation computers were developed. They used magnetic drums for memory and vacuum tubes as the basic component for circuitry (CPU). The disadvantages connected to these tubes were that they used to produce a lot of heat and were very large in size, and thus, resulted in several malfunctions.

1. b

2. c

3. b

4. a

5. b

if you go to ask a question say ask, there should be something that looks like this. a camera lens.