Which one of the following electronic technologies is the key technology for making the first generation computers?

The vacuum tube is the key technology for making first-generation computers.

Key PointsVaccumTube:

• The first generation computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms.
• Lee De Forest developed the vacuum tube.
• A vacuum tube is a device generally used to amplify a signal by controlling the movement of electrons in an evacuated space.​

Additional InformationTransistor-  It is an electronic component that can be used as an amplifier or as a switch. It is used to control the flow of electricity in radios, televisions, computers, and others.

Integrated Circuit- A small electronic circuit printed on a chip (usually made of silicon) contains many of its own circuits element.

Dual-Core CPU- Dual-core is a CPU that has two distinct processors that work simultaneously in the same integrated circuit. This type of processor can function as efficiently as a single processor but can perform operations up to twice as quickly. Because each core has its own cache, the operating system is able to handle most tasks in parallel.

Hence, the Vacuum Tube is the key technology for making first-generation computers.